Prince William opens up about losing his mother almost 20 years ago

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Prince William is notoriously reserved about his mother, Princess Diana, who died in a car crash in 1997 when he was just 15.

But during a visit to a charity in Stratford, London, he opened up about grieving to a 9-year-old who lost her father to pancreatic cancer six years ago.

"Do you know what happened to me?" William told Aoife. "You know I lost my mummy when I was very young too. I was [15] and my brother was 12. So we lost our mummy when we were young as well.

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Princess Diana's life in photos
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Princess Diana's life in photos
Princess Diana wearing a tiara and diamond necklace on an official visit to Australia, April 12th 1983. (Photo by Tim Graham/Getty Images)
UNITED KINGDOM - JULY 01: An informal study of Prince CHARLES, the Prince of Wales, and Lady Diana SPENCER, whose wedding will take place at Saint-Paul's Cathedral, London on 29th July 1981. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
LONDON - JULY 29: (FILE PHOTO) Prince Charles, Prince of Wales and Diana, Princess of Wales leave St. Paul's Cathedral following their wedding July 29, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)
LONDON - JULY 29: Diana, Princess of Wales and Prince Charles ride in a carriage after their wedding at St. Paul's Cathedral July 29, 1981 in London, England. (Photo by Anwar Hussein/WireImage)
Prince Charles and Diana, Princess of Wales (1961 - 1997) pose together during their honeymoon in Balmoral, Scotland, 19th August 1981. (Photo by Serge Lemoine/Getty Images)
Princess Diana wearing a Jasper Conran suit during a visit to a community centre in Brixton, October 1983. (Photo by Princess Diana Archive/Getty Images)
PARIS, FRANCE: Britain's Princess Diana arrived in Paris Friday, 13 November, 1992, on a private three day visit she is making without her husband, Prince Charles. (Photo credit should read JOEL ROBINE/AFP/Getty Images)
HONG KONG, HONG KONG: Britain's Princess Diana stands with tennis players Michael Chang of the US (L) and Sweden's Jonas Bjorkman during the awards ceremony at the Hong Kong Open 23 April. Princess Diana, on a private visit to Hong Kong, watched as Chang defeated Bjorkman 6-3, 6-1 to win the tournament. AFP PHOTO (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
The Princess of Wales visits Chinatown in Liverpool, April 1982. She is pregnant with Prince William, and wearing a pink wool maternity coat by Bellville Sassoon and a hat by John Boyd. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
WINDSOR, UNITED KINGDOM - JUNE 06: Princess Diana At Polo, Just Two Weeks Before The Birth Of Her First Child, Prince William. Wearing A Maternity Dress Designed By Fashion Designer Catherine Walker She Is Walking With Sarah Ferguson. (Photo by Tim Graham/Getty Images)
LONDON - JUNE 22: New born Prince William with Diana, Princess of Wales and Prince Charles leave St. Mary's hospital on June 22, 1982 in Paddington, London, England,. He was born in the Lindo Wing of the hospital on June 21. (Photo by David Levenson/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 01: Princess Diana Holding Her Baby Son, Prince William, At Kensington Palace. (Photo by Tim Graham/Getty Images)
NEW ZEALAND - APRIL 18: Princess Diana And Prince William In New Zealand. (Photo by Tim Graham/Getty Images)
(FILES) This picture taken 17 June 1997 shows Diana, Princess of Wales, a key volunteer of the British Red Cross Landmine Campaign at Red Cross headquarters in Washington DC. Princess Diana may have survived her fatal Paris car crash in 1997 if French medical staff had not wasted precious time, a leading British surgeon indicated at her inquest 19 November 2007. AFP PHOTO/FILES/Jamal (Photo credit should read JAMAL A. WILSON/AFP/Getty Images)
The Prince and Princess of Wales visit Barmouth in Wales, November 1982. She wears a suede beret by John Boyd and a coatdress by Arabella Pollen. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
The Princess of Wales visits University College Hospital in London, December 1982. She wears a John Boyd hat and a velvet suit by Caroline Charles. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 01: Princess Diana And Prince Charles With Prince William And His Koala Bear Toy At Kensington Palace (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997) at the School of the Air, in Alice Springs, Australia, 30th March 1983. She is wearing a dress by Jan van Velden. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
AYERS ROCK, AUSTRALIA - MARCH 21: Prince Charles, The Prince Of Wales And Diana, Princess Of Wales Standing In Front Of Ayers Rock During Their Official Tour Of Australia (Photo by Tim Graham/Getty Images)
NEW ZEALAND - APRIL 18: Princess Diana During A Visit To New Zealand Wearing A Dress Designed By Fashion Designer Donald Campbell (Photo by Tim Graham/Getty Images)
MANUKAU - APRIL 19: Diana Princess of Wales meets firemen during a visit to Manukau, near Auckland, New Zealand during the Royal Tour of New Zealand on April 19, 1983. Princess Diana wore a suit designed by Jan Van Velden, with a hat by John Boyd. (Photo by David Levenson/Getty Images)
CANADA - JUNE 23: Princess Diana in Edmonton during an official visit of Canada (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997) leaving St Mary's Hospital, London with her new-born son Prince Harry, September 1984. She is wearing a red coat by Jan van Velden. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
VENICE, ITALY - MAY 5: (FILE PHOTO) (L-R) Diana the Princess of Wales holds her son Harry, whilst looking at Prince William held by his father Prince Charles on May 5, 1985 in Venice, Italy. Prince William will celebrate his 21st birthday on June 21, 2003. (Photo by Georges de Keerle/Getty Images) On July 1st Diana, Princess Of Wales would have celebrated her 50th Birthday Please refer to the following profile on Getty Images Archival for further imagery. http://www.gettyimages.co.uk/Search/Search.aspx?EventId=107811125&EditorialProduct=Archival For further images see also: Princess Diana: http://www.gettyimages.co.uk/Account/MediaBin/LightboxDetail.aspx?Id=17267941&MediaBinUserId=5317233 Following Diana's Death: http://www.gettyimages.co.uk/Account/MediaBin/LightboxDetail.aspx?Id=18894787&MediaBinUserId=5317233 Princess Diana - A Style Icon: http://www.gettyimages.co.uk/Account/MediaBin/LightboxDetail.aspx?Id=18253159&MediaBinUserId=5317233
LA SPEZIA, ITALY - APRIL 20: The Prince and Princess of Wales in La Spezia during a tour of Italy. (Photo by Tim Graham/Getty Images)
TWERTON ON AVON - MAY 31: Diana Princess of Wales meets girl guides outside the Poolemead centre for the Deaf on May 31, 1985 in Twerton on Avon, Bath, Avon. (Photo by David Levenson/Getty Images)
CANADA - JULY 01: Diana Princess of Wales celebrates her birthday in Canada (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997) inspects a guard of honour during a two-day visit to the 1st Battalion, the Royal Hampshire Regiment in Berlin, October 1985. She is wearing a pink and black suit by Victor Edelstein and a hat by Frederick Fox. (Photo by Lucy Levenson/Princess Diana Archive/Getty Images)
UNITED KINGDOM - OCTOBER 04: Diana, Princess of Wales with her sons, Prince William and Prince Harry, at the piano in Kensington Palace (Photo by Tim Graham/Getty Images)
KLOSTERS, SWITZERLAND - FEBRUARY 06: Prince Charles With Princess Diana On A Ski-ing Holiday Together. The Princess Is Wearing A Red 'head' Ski Suit And A Headband And She Is Holding A Pair Of 'dynamic' Skis. The Prince Is Wearing A Blue Ski Suit And Carrying A Pair Of 'k2' Skis. (Photo by Tim Graham/Getty Images)
VIENNA - APRIL 16: Diana, Princess of Wales, wearing a sapphire diamond and pearl necklace, attends a banquet on April 16, 1986 in Vienna, Austria (Photo by Anwar Hussein/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana Carries Prince Henry (harry) On Her Shoulders At Highgrove. (Photo by Tim Graham/Getty Images)
UNITED KINGDOM - AUGUST 22: PRINCESS DIANA ON BOARD HMS TRAFALGAR NUCLEAR SUBMARINE MEETING THE CREW DURING A VISIT TO THE NAVAL SUBMARINE BASE IN FASLANE IN THE FIRTH OF CLYDE, SCOTLAND (Photo by Tim Graham/Getty Images)
SANDHURST - APRIL 10: Diana, Princess of Wales wears a Catherine Walker white suit with drum majorette gold frogging and epaulettes and a graham smith hat for her visit to the Sandhurst Military Academy on April 10, 1987 in Sandhurst, England (Photo by Anwar Hussein/Getty Images)
Princess Diana and Prince Charles of Wales attending a Lionel Richie concert at Wembley Arena, London, November 7th 1987. (Photo by Dave Hogan/Getty Images)
The Prince And Princess Of Wales At A Prizegiving, At Polo, Smiths Lawn, Windsor. (Photo by Julian Parker/UK Press via Getty Images)
Diana, The Princess Of Wales, And Prince William, At A Polo Match, Smiths Lawn, Windsor. (Photo by Julian Parker/UK Press via Getty Images)
ABERDEEN, SCOTLAND - AUGUST 14: Princess Diana With Her Sons Prince William And Prince Harry At Aberdeen Airport. (Photo by Tim Graham/Getty Images)
MAJORCA, SPAIN - AUGUST 10: Diana, Princess of Wales with Prince Harry on holiday in Majorca, Spain on August 10, 1987. (Photo by Georges De Keerle/Getty Images)
Princess Diana (1961 - 1997) driving an armoured vehicle with the Royal Hampshire Regiment at Tidworth, Hampshire, 23rd June 1988. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
CHAMBORD, FRANCE - NOVEMBER 09: Diana, Princess of Wales, wearing a white and blue lace and sequin evening coat-dress designed by Catherine Walker for a dinner at the Chateau de Chambord during her official visit to France. (Photo by Tim Graham/Getty Images)
The Princess of Wales at the museum in Kuwait City, March 1989. She is wearing a gold embroidered bedouin gown that was presented to her with a silver tea set to mark the occasion of her visit. (Photo by Jayne Fincher/Getty Images)
The Princess of Wales with her sons William and Harry on the chair lift during a skiing holiday in Lech, Austria, April 1991. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
LONDON, ENGLAND - MARCH 7 Diana, Princess of Wales attends the Premiere of Dangerous Liaisons, in London's West End, on March 7, 1989 in London, United Kingdom. (Photo by Julian Parker/UK Press via Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - MARCH 15: The Prince And Princess Of Wales attend a desert picnic on March 15, 1989 in Adu Dhab, United Arab Emirates. (Photo by Georges De Keerle/Getty Images)
BATH - MAY 30: (FILE PHOTO) Prince William, Diana, Princess of Wales, Prince Harry and Charles, Prince of Wales, attend the wedding of the Duke of Hussey's daughter in May, 1989 in Bath, England. (Photo by Anwar Hussein/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 11: Princess Diana With Her Sons Prince William And Prince Harry Standing On The Steps Of Wetherby School On The First Day For Prince Harry. (Photo by Tim Graham/Getty Images)
INDONESIA - NOVEMBER 05: The Princess Of Wales Playing Bowls At Sitanalia Leprosy Hospital In Indonesia (Photo by Tim Graham/Getty Images)
NIGERIA - JUNE 3: (FILE PHOTO) (PRINCESS DIANA RETROSPECTIVE 17 OF 22) The Princess of Wales speaks with Nigerians circa 1990 during a visit to Nigeria. Princess Diana, 36-years-old, died with her companion Dodi Fayed, 41-years-old, in a car crash August 31, 1997 in Paris, France. Fayed was the son of an Egyptian billionaire. (Photo by Georges De Keerle/Getty Images)
The Princess of Wales and the Queen Mother in an open-topped landau on their way to the Royal Ascot race meeting, June 1990. The Princess wears a Catherine Walker suit and a Philip Somerville hat. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
The Princess of Wales walks amongst crowds of children waving flags during her visit to Cullompton in Devon, September 1990. She is wearing a Catherine Walker dress. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
WASHINGTON, UNITED STATES - OCTOBER 05: Princess Diana With Mrs Barbara Bush At The White House (Photo by TIM GRAHAM/Getty Images)
Diana, The Princess Of Wales Takes Her Sons, Prince'S William, And Harry Out On The Boat ' Maid Of The Mist ' To View Niagara Falls. (Photo by Julian Parker/UK Press via Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 18: Diana Princess of Wales attends the Premiere of Hot Shots, in London's West End, on November 18, 1991 in London, United Kingdom. (Photo by Julian Parker/UK Press via Getty Images)
The Princess of Wales (1961 - 1997) talks to children at the British school in Seoul during a visit to Korea, 1992. (Photo by Linda Grove/Getty Images)
INDIA - FEBRUARY 11: Diana Princess of Wales sits in front of the Taj Mahal during a visit to India (Photo by Tim Graham/Getty Images)
CALCUTTA;INDIA - FEBRUARY: Princess Diana the Princess of Wales holds hands with a nun at Mother Teresa's Hospice in Calcutta during her visit to India in February of 1992. (Photo by Anwar Hussein/Getty Images)
GIZA, EGYPT - MAY 12: Diana Princess of Wales visiting the Pyramids in Giza during an official tour of Egypt. (Photo by Tim Graham/Getty Images)
EGYPT - MAY 13: Diana, Princess of Wales in teh Alazhar Mosque, Cairo, Egypt (Photo by Tim Graham/Getty Images)
LONDON, ENGLAND - JUNE 13: Diana, Princess of Wales, Queen Elizabeth, The Queen Mother, and Prince Harry, attend the Trooping The Colour Ceremony on June 13, 1992 in London, United Kingdom. (Photo by Julian Parker/UK Press via Getty Images)
Princess Diana (1961 - 1997) on a skiing holiday in Lech, Austria, March 1993. (Photo by Jayne Fincher/Getty Images)
Princess Diana (1961 - 1997) meets local people during a field visit to Red Cross projects in the remote mountain villages of Nepal, 3rd March 1993. (Photo by Princess Diana Archive/Getty Images)
Diana Princess Of Wales, Prince William & Prince Harry Visit The 'Thorpe Park' Amusement Park. (Photo by Julian Parker/UK Press via Getty Images)
Princess Diana (1961 - 1997) during a visit to the Red Cross borehole project for refugees in Zimbabwe, July 1993. She is wearing a safari suit by Catherine Walker. (Photo by Jayne Fincher/Getty Images)
Princess Diana (1961 - 1997), Prince Harry, Prince William and Prince Charles at a parade in the Mall, London, during V.J. Day commemorations, August 1994. Diana is wearing a Tomasz Starzewski suit and a hat by Philip Somerville. (Photo by Terry Fincher/Getty Images)
UNITED KINGDOM - MAY 20: Princess Diana Reviewing The Troops Of The Princess Of Wales Regiment In Kent. The Princess Is Wearing A Pink Suit Designed By Versace. (Photo by Tim Graham/Getty Images)
Diana, Princess Of Wales Attends The Serpentine Gallery Summer Party. (Photo by Julian Parker/UK Press via Getty Images)
LONDON -OCTOBER 08: Diana, Princess of Wales laughs as she visits the London Lighthouse, the HIV/Aids charity, to help launch it's £1.5 million Capital Appeal on October 08, 1996 in London, England . (Photo by Anwar Hussein/Getty Images)
Diana, Princess of Wales at Costume Institute Gala at Metropolitan Museum of Art for a benefit ball. (Photo By: Richard Corkery/NY Daily News via Getty Images)
ANGOLA - JANUARY 15: Diana, Princess of Wales wearing protective body armour, visits a minefield being cleared by the chirty Halo in Huambo, Angola (Photo by Tim Graham/Getty Images)
WINDSOR, UNITED KINGDOM - MARCH 09: Official Portrait Of The Royal Family On The Day Of Prince William's Confirmation. Front Left To Right - Prince William, Princess Diana, Prince William, Prince Charles And The Queen. Back Left To Right - King Constantine, Lady Susan Hussey, Princess Alexandra, Duchess Of Westminster And Lord Romsey (Photo by Tim Graham Picture Library/Getty Images)
GREAT BRITAIN - JUNE 06: Diana, Princess of Wales crouching down to embrace a pupil at the Shri Swaminarayan Mandir in Neasden (Photo by Tim Graham/Getty Images)
Diana, The Princess Of Wales Visits Washington, Usa.Gala Dinner Held By The American Red Cross, To Raise Funds For Landmine Victims Around The World. . (Photo by Mark Cuthbert/UK Press via Getty Images)
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He then asked the girl: "Do you speak about your daddy? It's very important to talk about it. Very, very important."

The Duke and Duchess of Cambridge, Kate, met kids at the Child Bereavement UK Centre, a charity that helps families deal with the loss of a loved one, which was founded in 1994 by one of Diana's closest friends, Julia Samuel.

Along with Prince Harry, William and Kate have focused their activities on mental health awareness.

William admitted he was very angry after Diana died, almost 20 years ago.

"He told us how he felt angry when she died. He very specifically used that word anger, he felt angry about it," a mum who was at the event said.

In July last year, Prince Harry told Rio Ferdinand, the former England and Manchester United footballer who lost his wife last year, that he regretted not opening up sooner about his mother's death.

RELATED: Prince William through the years:

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Prince William through the years
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Prince William through the years
STIRLING, SCOTLAND - OCTOBER 24: Prince William, Duke of Cambridge during a visit to Stirling Castle on October 24, 2016 in Stirling, Scotland. The Duke of Cambridge in his role as Earl of Strathearn is Patron of The Thin Red Line Appeal to redevelop The Argyll and Sutherland Highlanders Regimental Museum at the Castle. (Photo by Mark Runnacles/Getty Images)
STIRLING, SCOTLAND - OCTOBER 24: Prince William, Duke of Cambridge meets local children during a visit to Stirling Castle on October 24, 2016 in Stirling, Scotland. The Duke of Cambridge in his role as Earl of Strathearn is Patron of The Thin Red Line Appeal to redevelop The Argyll and Sutherland Highlanders Regimental Museum at the Castle. (Photo by Mark Runnacles/Getty Images)
LONDON, ENGLAND - OCTOBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge meet athletes at a reception for Team GB's 2016 Olympic and Paralympic teams hosted by Queen Elizabeth II at Buckingham Palace October 18, 2016 in London, England. (Photo by Yui Mok - WPA Pool /Getty Images)
MANCHESTER, ENGLAND - OCTOBER 14: Prince William, Duke of Cambridge gets in a BAC 'Mono' Car as he visits the National Graphene Institute at the University of Manchester during their visit to Manchester on October 14, 2016 in Manchester, England. (Photo by Luca Teuchmann/WireImage)
LONDON, ENGLAND - OCTOBER 10: Prince William, Duke Of Cambridge attends the '100 Women In Hedge Funds' Gala Dinner In Aid Of Skillforce at Middle Temple Hall on October 10, 2016 in London, England. (Photo by Stuart C. Wilson - WPA Pool /Getty Images)
VICTORIA, BC - OCTOBER 01: (NO UK SALES FOR 28 DAYS) Prince William, Duke of Cambridge visits the Cridge Centre for the Family on October 1, 2016 in Victoria, Canada. (Photo by Pool/Samir Hussein/WireImage)
VICTORIA, BC - OCTOBER 01: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Prince George and Princess Charlotte depart Victoria after the Royal Tour of Canada at Victoria Inner Harbour on October 1, 2016 in Victoria, Canada. (Photo by Karwai Tang/WireImage)
HAIDA GWAII, BC - SEPTEMBER 30: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at the Haida Heritage Centre and Museum on September 30, 2016 in Haida Gwaii, British Columbia, Canada. (Photo by Karwai Tang/WireImage)
HAIDA GWAII, BC - SEPTEMBER 30: Catherine, Duchess of Cambridge and Prince William Duke of Cambridge arrive in a traditional canoe at Haida Heritage Centre on September 30, 2016 in Haida Gwaii, Canada. The Royal couple along with their Children Prince George of Cambridge and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson/Getty Images)
ST. AUSTELL, UNITED KINGDOM - SEPTEMBER 02: Prince William, Duke of Cambridge visits the Eden Project in Cornwall on September 2, 2016 near St Austell, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
ST. AUSTELL, UNITED KINGDOM - SEPTEMBER 02: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Eden Project in Cornwall on September 2, 2016 near St Austell, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
TRURO, UNITED KINGDOM - SEPTEMBER 01: Prince William, Duke of Cambridge visits Truro Cathedral on September 1, 2016 in Truro, United Kingdom. (Photo by Mark Cuthbert/UK Press via Getty Images)
ALBERT, FRANCE - JULY 01: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with Prince Harry attend the Commemoration of the Centenary of The Battle of the Somme at The Commonwealth War Graves Commision Thiepval Memorial on July 01, 2016 in Albert, France. (Photo by UK Press Pool/UK Press via Getty Images)
ALBERT, FRANCE JUNE 30: Prince William, Duke of Cambridge speaks at the Somme Centenary commemorations at the Thiepval Memorial on June 30, 2016 in Albert, France. (Photo by Steve Parsons - Pool/Getty Images)
LONDON, ENGLAND - JUNE 11: Catherine, Duchess of Cambridge, Princess Charlotte, Prince George and Prince William, Duke of Cambridge and Queen Elizabeth II tand on the balcony during the Trooping the Colour, this year marking the Queen's official 90th birthday at The Mall on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Luca Teuchmann/Luca Teuchmann/WireImage)
LONDON, UNITED KINGDOM - JUNE 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge salutes as he attends Trooping the Colour, this year marking the Queen's 90th birthday on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Max Mumby/Indigo/Getty Images)
GUWAHATI, INDIA - APRIL 12: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge pose with dancers during a Bihu Festival Celebration at Diphlu River Lodge atKaziranga National Park on April 12, 2016 in Guwahati, India. (Photo by Samir Hussein/WireImage)
KAZIRANGA, ASSAM - APRIL 12: Catherine, Duchess of Cambridge looks on as Prince William, Duke of Cambridge tries to play an Indian whistle during a Bihu Festival Celebrationat Diphlu River Lodge on day 3 of the royal visit to India and Bhutan on April 12, 2016 in Kaziranga, India. The Duke and Duchess of Cambridge are on a week-long tour of India and Bhutan taking in Mumbai, Delhi, Assam, Bhutan and Agra. (Photo by Joe Giddens-Pool/Getty Images)
MUMBAI, INDIA - APRIL 10: Prince William, Duke of Cambridge, and Catherine, Duchess Of Cambridge, during Bollywood inspired charity gala dinner at Taj Palace Hotel on April 10, 2016 in Mumbai, India. (Photo by Pramod Thakur/Hindustan Times via Getty Images)
Britain Horse Racing - Royal Ascot - Ascot Racecourse - 15/6/16 Britain's Prince William Action Images via Reuters / Andrew Boyers Livepic EDITORIAL USE ONLY.
Britain's Prince William signs the book of condolences for the victims of the attacks in Paris, at the French Embassy, Knightsbridge, London, November 17, 2015. REUTERS/Jonathan Brady/Pool
Britain's Queen Elizabeth and Prince William, Duke of Cambridge, (R) chat with each other in the Royal Box at the Royal Albert Hall during the Annual Festival of Remembrance in London November 7, 2015. REUTERS/Chris Jackson/Pool
Britain's Prince William, Duke of Cambridge, poses after painting the eye of a "Shaun the Sheep" sculpture at the British Ambassador's official residence in Beijing March 2, 2015. REUTERS/Fred Dufour/Pool (CHINA - Tags: POLITICS ROYALS ENTERTAINMENT PROFILE HEADSHOT)
Britain's Prince William, Duke of Cambridge, waves to fans from a car window upon his arrival at the Tsutaya bookstore Daikanyama in Tokyo February 28, 2015. Prince William visited the bookstore to launch a week-long public exhibition titled "Innovation is Great". Prince William is in Japan for a four-day visit. REUTERS/Issei Kato (JAPAN - Tags: ROYALS ENTERTAINMENT)
Britain's Catherine, Duchess of Cambridge, carries her son Prince George as he examines a butterfly on the hand of his father Prince William during a visit to the Sensational Butterflies exhibition at the Natural History Museum in London, July 2, 2014. Prince George celebrates his first birthday on July 22. Picture taken July 2, 2014. REUTERS/John Stillwell/Pool (BRITAIN - Tags: ROYALS SOCIETY) ATTENTION EDITORS - FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
Britain's Prince William prepares to dive at a swimming pool, with British Sub-Aqua Club (BSAC) members, in central London July 9, 2014. The Prince and his father Prince Charles attended a reception to mark the handover of the Presidency of BSAC from Prince Charles to Prince William. REUTERS/Justin Tallis/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS)
Britain's Catherine, the Duchess of Cambridge, waves with her husband Prince William, as she holds her son Prince George before they depart Canberra April 25, 2014. The Prince and his wife Kate are undertaking a 19-day official visit to New Zealand and Australia with their son Prince George. REUTERS/Phil Noble (AUSTRALIA - Tags: POLITICS ENTERTAINMENT ROYALS)
Britain's Prince William waves with his wife Catherine, the Duchess of Cambridge, as they walk down the steps of the Sydney Opera House April 16, 2014. Britain's Prince William, his wife Kate and their son Prince George flew from New Zealand to Australia, where they will now spend nine-days touring the country. REUTERS/David Gray (AUSTRALIA - Tags: ROYALS ENTERTAINMENT)
Catherine (R), Duchess of Cambridge, and her husband, Britain's Prince William, laugh as they watch a young players' rugby tournament held at Forsyth Barr Stadium in Dunedin April 13, 2014. Prince William and his wife are undertaking a 19-day official visit to New Zealand and Australia with their son, Prince George. REUTERS/David Rowland/Pool (NEW ZEALAND - Tags: SOCIETY ROYALS SPORT RUGBY TPX IMAGES OF THE DAY)
Britain's Prince William smiles during a visit to the head office of the St Giles Trust, in Camberwell, south east London November 6, 2013. The St Giles Trust works with former criminals to help them break the cycle of crime. REUTERS/David Crump/Pool (BRITAIN - Tags: SOCIETY ROYALS)
Britain's Prince William and his wife Catherine, Duchess of Cambridge appear with their baby son, outside the Lindo Wing of St Mary's Hospital, in central London July 23, 2013. Prince William and his wife Kate gave the world its first glimpse of their new baby on Tuesday when they left hospital to a barrage of camera flashes with the boy who is third in line to the British throne. Picture taken July 23, 2013. REUTERS/Cathal McNaughton (BRITAIN - Tags: ROYALS ENTERTAINMENT HEALTH)
Britain's Prince William walks through the set used to depict Hogwart's 'Great Hall' in the Harry Potter films during the inauguration of Warner Bros. Studios Leavesden in London April 26, 2013. REUTERS/Chris Jackson/POOL (BRITAIN - Tags: ROYALS ENTERTAINMENT)
Britain's Prince William and his wife Catherine, Duchess of Cambridge speak with recently bereaved children William, Beatrice and Georgina Howitt (L-R) during their visit to the offices of Child Bereavement UK in Saunderton, southern England March 19, 2013. REUTERS/Paul Edwards/pool (BRITAIN - Tags: ROYALS ENTERTAINMENT SOCIETY)
Britain's Prince William leaves the King Edward VII hospital with his wife Catherine, Duchess of Cambridge, London December 6, 2012. Prince William's pregnant wife Kate left the King Edward VII hospital in central London on Thursday where she had spent four days being treated for acute morning sickness. REUTERS/Andrew Winning (BRITAIN - Tags: ENTERTAINMENT ROYALS)
Britain's Prince William speaks at the Mission Serve: Hiring Our Heroes event in Culver City, California July 10, 2011. Prince William and his wife Catherine are on a royal visit to California from July 8 to July 10. REUTERS/Danny Moloshok (UNITED STATES - Tags: POLITICS ROYALS ENTERTAINMENT)
Britain's Prince William paints a picture during a tour of the Inner City Arts campus in Los Angeles, California July 10, 2011. Prince William and his wife Catherine, Duchess of Cambridge are on a royal visit to California from July 8 to July 10. REUTERS/Alex Gallardo (UNITED STATES - Tags: POLITICS ROYALS SOCIETY ENTERTAINMENT)
Britain's Prince William plays in a charity polo match at the Santa Barbara Polo and Racquet Club in support of the American Friends of The Foundation of Prince William and Prince Harry in Santa Barbara, California, July 9, 2011. REUTERS/Gus Ruelas (UNITED STATES - Tags: ENTERTAINMENT POLITICS ROYALS SPORT)
Britain's Prince William tips his hat to Calgary during his speech at the Calgary Stampede in Calgary, Alberta, July 7, 2011. The Prince and his wife are on a royal tour of Canada from June 30 to July 8. REUTERS/Todd Korol (CANADA - Tags: ROYALS ENTERTAINMENT SOCIETY HEADSHOT)
Britain's Prince William and his wife Catherine, Duchess of Cambridge, chat with flower presenters Ameile Wood and Marco Paolo Esteban (R) upon their arrival in Yellowknife, Northwest Territories July 4, 2011. Prince William and his wife Catherine are on a royal tour of Canada from June 30 to July 8. REUTERS/Andy Clark (CANADA - Tags: ROYALS SOCIETY ENTERTAINMENT POLITICS)
Britain's Prince William and his wife Catherine, Duchess of Cambridge, look at oysters in Dalvay-by-the Sea, Prince Edward Island July 4, 2011. REUTERS/Mark Large/Pool (CANADA - Tags: ENTERTAINMENT POLITICS SOCIETY ROYALS)
Britain's Prince William greets spectators during an official welcoming ceremony at Rideau Hall in Ottawa June 30, 2011. Prince William and his wife Catherine, Duchess of Cambridge, are on a royal tour of Canada from June 30 to July 8. REUTERS/Chris Wattie (CANADA - Tags: ENTERTAINMENT POLITICS ROYALS SOCIETY)
Britain's Prince William inspects the honour guard during an official welcoming ceremony at Rideau Hall in Ottawa June 30, 2011. Prince William and his wife Catherine, Duchess of Cambridge, are on a royal tour of Canada from June 30 to July 8. REUTERS/Chris Wattie (CANADA - Tags: ENTERTAINMENT POLITICS ROYALS)
Britain's Catherine, Duchess of Cambridge (L) sits in the Royal Box on Centre Court with her husband Prince William, for the match between Andy Murray of Britain and Richard Gasquet of France at the Wimbledon tennis championships in London June 27, 2011. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS SPORT TENNIS)
Britain's Prince William and his wife Catherine, Duchess of Cambridge kiss on the balcony at Buckingham Palace, watched by bridemaids Grace van Cutsem (L) and Margarita Armstrong-Jones and pageboy Tom Pettifer, after their wedding in Westminster Abbey, in central London April 29, 2011. Prince William married his fiancee, Kate Middleton, in Westminster Abbey on Friday (ROYAL WEDDING/ BALCONY) REUTERS/Dylan Martinez (BRITAIN - Tags: ROYALS ENTERTAINMENT SOCIETY) BEST QUALITY AVAILABLE
Britain's Prince William and his wife Catherine, Duchess of Cambridge kiss on the balcony of Buckingham Palace, following following their wedding at Westminster Abbey in London April 29, 2011. (ROYAL WEDDING/BALCONY) REUTERS/John Stillwell/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS)
Britain's Prince William smiles after showing his grandmother, Queen Elizabeth, around a Sea King search and rescue helicopter, during a visit to RAF Valley, in north Wales, April 1, 2011. Prince William, who is due to marry Kate Middleton on April 29, is serving as a search and rescue helicopter pilot, based at RAF Valley on Anglesey, an island off the north west coast of Wales. REUTERS/Phil Noble (BRITAIN - Tags: ENTERTAINMENT ROYALS)
Britain's Prince William sits at the controls of a Sea King helicopter during a training exercise at Holyhead Mountain, in Wales March 31, 2011. Prince William is serving as a search and rescue helicopter pilot, based at RAF Valley on Anglesey, an island off the north west coast of Wales. Photograph taken on March 31, 2011. REUTERS/John Stillwell/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS)
Britain's Prince William attends a national memorial service for victims of last month's earthquake, in Christchurch March 18, 2011. REUTERS/Mick Tsikas (NEW ZEALAND - Tags: ROYALS POLITICS DISASTER HEADSHOT)
Britain's Prince William wears an iconic Australian Akubra hat as he greets the crowd during his visit to Toowomba, Queensland, March 20, 2011. Prince William is on a tour of New Zealand and Australia in a show of solidarity with the two countries that have been plagued by natural disasters in the last year. REUTERS/Daniel Munoz (AUSTRALIA - Tags: POLITICS ROYALS)
Britain's Prince William greets people after his arrival in Cardwell, Queensland March 19, 2011. Prince William is on a tour of New Zealand and Australia in a show of solidarity with the two countries that have been plagued by natural disasters in the last year. REUTERS/Daniel Munoz (AUSTRALIA - Tags: POLITICS ROYALS)
Britain's Prince William gestures while speaking with members of the Urban Search and Rescue team in Christchurch March 17, 2011. Prince William is visiting New Zealand until March 19. REUTERS/Hannah Johnston/Pool (NEW ZEALAND - Tags: ROYALS POLITICS)
Britain's Prince William leaves a charity event at city company ICAP, in central London December 8, 2010. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT BUSINESS SOCIETY ROYALS)
Britain's Prince William (L) and his girlfriend Kate Middleton are seen attending the Six Nations international rugby union match against Italy in London in this February 10, 2007 file photograph. Britain's Prince William is to marry his long-term girlfriend Kate Middleton next year, Buckingham Palace said on November 16, 2010. REUTERS/Eddie Keogh/Files (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS SPORT RUGBY)
Britain's Princes Harry and William visit the Red Cross Childrens' Hospital in Cape Town, June 18, 2010. REUTERS/Mike Hutchings (SOUTH AFRICA - Tags: POLITICS ROYALS ENTERTAINMENT)
Britain's Prince William visits a school run by the charity Sentebale, founded by Prince Harry and Lesotho's Prince Seesio, in the village of Semongkong, Lesotho June 17, 2010. Princes Harry and William are on a two day tour to Lesotho. REUTERS/Arthur Edwards/POOL (LESOTHO - Tags: ROYALS POLITICS SOCIETY)
Britain's Duke of York and Prince William (R) take part in the procession of the Order of the Garter in Windsor, London June 14, 2010. The order was founded by King Edward III in 1348 and includes the Prince of Wales and 24 knights. REUTERS/Sergeant Dan Harmer/MoD/Crown Copyright/handout (BRITAIN - Tags: ROYALS) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
Britain's Prince William wears a pair of special pair of glasses which simulate the affects of maculor degeneration during his visit to St Dunstan's, a specialist centre for blind ex-service men and women, in Llandudno, North Wales February 22, 2010. REUTERS/Peter Byrne/pool (ROYALS ENTERTAINMENT SOCIETY MILITARY)
Britain's Prince William arrives at Sydney's Kingsford Smith airport to begin the Australian leg of his tour January 19, 2010. REUTERS/Mike Bowers (AUSTRALIA - Tags: SOCIETY ROYALS)
Prince William of Britain speaks during the opening of the new Supreme Court building in Wellington on the second day of a three day visit to New Zealand January 18, 2010. REUTERS/POOL/Mike Heydon (NEW ZEALAND - Tags: ROYALS)
Britain's Prince William (R) applauds after his brother Prince Harry delivered a speech in west London January 8, 2009. The Princes attended a reception as joint patrons to mark the formal launch of a charity, the Henry Van Strawbenzee Memorial Fund. The charity was set up following the death of Henry Van Strawbenzee - a friend of the Princes - and aims to support schools in Uganda, where Henry was working. REUTERS/Toby Melville (BRITAIN)
Britain's Prince William sits with his father Prince Charles (R) and Chelsy Davy (L) as his brother Prince Harry is awarded the Operational Service Medal for Afghanistan by his aunt, Princess Anne, during a service at the Combermere Barracks in Windsor May 5, 2008. Harry and other members of the Household Cavalry Regiment were awarded military service medals on Monday for 10 weeks of frontline service in Afghanistan. REUTERS/John Stillwell/Pool (BRITAIN)
Britain's Prince William talks with members of the "Cycle of Life" team at Clarence House in London March 31, 2008, before they set off for their 5000 mile ride across rural Africa in aid of charity "Tusk Trust". REUTERS/Stephen Hird (BRITAIN)
Britain's Prince William attends the annual Remembrance Sunday ceremony on Armistice Day at the Cenotaph in Whitehall in central London, November 11, 2007. REUTERS/Toby Melville (BRITAIN)
Britain's Princes William (L) and Harry speak on stage at Wembley Stadium in London at the "Concert for Diana", held in memory of their mother Princess Diana, July 1, 2007. On what would have been Diana's 46th birthday, Princes William and Harry have lined up a string of pop veterans from Rod Stewart to Duran Duran for a six-hour show being broadcast to 145 countries. REUTERS/Stephen Hird (BRITAIN)
Britain's Prince William arrives for a Service of Thanksgiving for the 80th Birthday of Britain's Queen Elizabeth II at St. Paul's Cathedral in London June 15, 2006. The Queen's official 80th birthday is on June 17, 2006. REUTERS/John D McHugh/AFP Photo/WPA Pool (BRITAIN)
England's Prince William applauds during the Group B World Cup 2006 soccer match between England and Paraguay in Frankfurt June 10, 2006. FIFA RESTRICTION - NO MOBILE USE (GERMANY) REUTERS/Eddie Keogh
Britain's Prince William talks to journalists after a training session with players from Charlton Athletic Football Club at their training ground in London October 28, 2005. William will become president of the English Football Association in May next year.
Prince William signs a book of condolence in memory of those who where killed and injured in the terrorist attacks on London, at the British Consulate in Auckland July 9, 2005. Prince William signed the book in-between performing official duties and watching the British and Irish Lions tests during his ten-day tour of New Zealand, his first official tour of a foreign country by himself.
Prince William waves on arrival at the Guildhall in Windsor, southern England, for the civil wedding ceremony of his father [Prince Charles to Camilla Parker Bowles] April 9, 2005. [Prince Charles and his long-term partner, who became Her Royal Highness the Duchess of Cornwall on the marriage, married on Saturday in a low-key ceremony.]
Prince William, son of Britain's Prince Charles, waves on his arrival at the Guildhall in Windsor, southern England for his father's civil wedding ceremony to Camilla Parker Bowles, April 9, 2005. Prince Charles and his long-term partner Camilla, who becomes the Duchess of Cornwall on the marriage, married on Saturday in a low-key ceremony. REUTERS/Russell Boyce CRB/ASA
Britain's Prince William makes his water polo debut for the Scottish national universities squad in the annual Celtic Nations tournament against Wales and Ireland in Cardiff, 17 April, 2004. REUTERS/POOL DBP
Britain's Prince William smiles during a visit to the opening of Pilot Project in Newport, south Wales, June 19, 2003. The project is an art based project to provide homeless people with confidence that could enable them to move onto further education, training and employment. Prince William is taking part in an official visit to Wales, with his father Prince Charles, to mark his impending 21st birthday on June 21. The trip will be the only official engagement to mark his coming of age. REUTERS/Russell Boyce RUS/MD
Britain's Princes William (R) and Harry arrive for the annual Trooping the Colour Parade held to mark the birthday of Britain's Queen Elizabeth II in central London June 14, 2003. The Queen's actual birthday falls on April 21 and saw her turn 77 this year, however it is customary for the official birthday celebrations to be held on a Saturday in June. REUTERS/Keith Waldegrave NMB
Prince William sits in front of lobster pots on the harbourside at St Andrews, Scotland, May 28, 2003. The Prince, who celebrates his 21st birthday in June, is two years into a four year History of Art degree at the Scottish university city.
Prince William is pictured inside St Andrews University, Scotland, May 28, 2003. The Prince, who celebrates his 21st birthday in June, is two years into a four year History of Art degree.
Viscount Linley (L) and Prince William follow the gun carriage carrying the coffin of the Queen Mother during a ceremonial procession in central London, April 5, 2002. Thousands of mourners lined the route to pay their last respects to the Queen Mother who died aged 101. The funeral will take place on April 9 after which she will be interred at St George's Chapel in Windsor next to her late husband King George VI. REUTERS/Michael Crabtree PS
Britain's Prince William, [eldest son of The Prince of Wales] sits in front of the extinct volcano, Arthur's Seat, in the grounds of Holyrood House Palace, Edinburgh, Scotland, September 21, 2001. He starts his university course at Saint Andrews studying art history next week.
Princes William and Harry (L) leave St. Paul's Cathedral in central London July 11. The Royal Family were joined by monarchs from around Europe and British centenarians to start a month of celebrations to mark the 100th birthday of the [Queen Mother. ]
Prince William sits in front of a computer at his school, Eton College in this photo, one of a series officially released by St James Palace, June 16 to mark the Prince's eighteenth birthday next week. The Prince is currently studying for his A Level exams before going on to university. HP/ws
Britain's Prince Charles (C) looks on as his sons Prince William (L) and Harry (R) accept gifts of Roots clothing as worn by the Canadian Olympic Team, March 24. The Princes were on hand at a reception at the Vancouver Trade and Convention Centre for the unveiling of a plan to set aside more parklane in British Columbia. CANADA ROYALS
Diana, the Princess of Wales, is shown entering a production of Beauty and the Beast in MGM Studios at Walt Disney World with her son Prince William August 25
FILE PHOTO APRIL 92 - After the announcement yesterday of the separation between [Princess Diana and the Prince of Wales], there is a speculation that their eldest son Prince William (seen here at an Eastern Sunday Service) will take the throne after Prince-Charles steps aside.
Britain's Prince William (L) and Prince Harry wave from the deck of the Royal Yacht Britannia after arriving aboard on the Toronto waterfront on October 22, 1991. REUTERS/Andy Clark
Princess Diana holds Prince Harry as her older son Prince William (L) looks out over the balcony of Buckingham Palace in London on June 11, 1988 after attending the Trooping the Colour ceremony, the Queen's birthday parade. REUTERS/Stringer
Prince William (L) peeks around at his brother Prince Harry (R) on board a boat on Necker Island in the British Virgin Islands where they were on holiday April 8, 1990. REUTERS/Rob Taggart
Princess Diana holds her two sons Prince William, 6, and Prince Harry, 3, (front) as they pose during the mornings's picture session on August 9, 1987 in Palma de Mallorca, Spain. REUTERS/Hugh Peralta
Prince William is seen making a royal salute as he watches the scene of Trooping the Colour from the balcony of Buckingham Palace with his brother Harry and mother Princess Diana in London in this June 15, 1985 file photograph. Britain's Prince William is to marry his long-term girlfriend Kate Middleton next year, Buckingham Palace said on November 16, 2010. REUTERS/Roy Letkey/Files (BRITAIN - Tags: SOCIETY ROYALS)
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