Princes William & Harry reveal Princess Diana's private humor and their last convo with her in HBO doc

In a new HBO documentary, Prince William and Prince Harry come together to give their first-ever joint interview about their late mother, Princess Diana, who died 20 years ago on Aug. 31, 1997.

Diana, Our Mother: Her Life and Legacy, premiering Monday, July 24 at 10 p.m. ET/PT, offers a touching look at the late royal's whirlwind life, from her youthful days wearing men's jerseys and reading trashy romantic novels to becoming the "people's princess" to her lasting impact years beyond her tragic death.

While the 65-minute film features interviews with Sir Elton John, Rihanna, Diana's family and childhood friends as well as her former employees, it's the conversations with her two sons that are most revealing.

"She was our mum. She still is our mum. And of course, as a son I would say this, she was the best mum in the world...She smothered us with love, that's for sure," Harry says early on.

While looking at never-before-seen photos taken from an album Diana assembled while she was still alive, the two share untold stories and memories.

"Behind closed doors, she was a loving mother and an incredibly funny person," Harry says at one point. In fact, both William and his brother recall their mother's sense of humor only seen by them.

MORE: Prince William and Prince Harry Open Up About Princess Diana's Parenting Style

For Harry, the one thing that sticks with him the most is her laugh. "All I can hear is her laugh in my head," he says, adding that one of her mottos to him was, "You can be as naughty as you want, but just don't get caught."

"She was the naughtiest parent," he adds.

Diana, William & Harry At Thorpe ParkGetty

Meanwhile, William recalls her sending ridiculous cards to his school, causing him to get nervous to open them in public. But one moment that left him floored was when he was 12 or 13 years old.

"She organized -- when I came home from school -- to have Cindy Crawford, Christy Turlington and Naomi Campbell waiting at the top of the stairs," he recalls. "I went bright red and didn't know what to say... I was completely and utterly awestruck."

While Diana lived a very public life, speaking out on issues and dedicating her time to humanitarian work, Harry says that she turned to her two sons for escape. "You need respite, somewhere to go to dump it," he says. "I think she lived a lot of her life, especially in private, through us."

"Our mother was a total kid through and through," he continues, revealing that she would sneak them out to movies and take them on long drives listening to Enya ("That's a blast from the past.") all so they could live normal lives.

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Princess Diana with her sons
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Princess Diana with her sons
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)
Princes William and Harry with their mother, Diana, Princess of Wales (1961 - 1997) in the garden of Highgrove House in Gloucestershire, 18th July 1986. William is wearing a Dallas Cowboys t-shirt.(Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana At Highgrove With Prince William And Prince Harry Dressed In Miniature Parachute Regiment Uniforms And Playing On Their Slide In The Garden (Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana With Her Sons Prince William And Prince Harry Playing With A Playhouse In The Garden Of Their Home Highgrove (Photo by Tim Graham/Getty Images)
The Prince and Princess of Wales on holiday with their children, Princes William and Harry, at the Spanish royal residence Marivent Palace, August 1987. (Photo by Terry Fincher/Getty Images)
The Princess of Wales arriving at Aberdeen airport with her sons William and Harry for a holiday at Balmoral Castle, August 1986. Princess Diana is wearing a polo motive sweater by Mondi. (Photo by Jayne Fincher/Getty Images)
UNITED KINGDOM - DECEMBER 01: Prince Charles, Prince of Wales and Diana, Princess of Wales at home in Kensington Palace with their sons Prince William and Prince Harry (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 16: Princess Diana And Prince William Leaving After Delivering Prince Harry To Mrs. Mynor's Nursery School. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JUNE 11: Diana, Princess Of Wales, Holding A Young Prince Harry In Her Arms As She Watches Trooping The Colour With Prince William And Princess Margaret From The Balcony Of Buckingham Palace. (Photo by Tim Graham/Getty Images)
BALMORAL, SCOTLAND - AUGUST 18: Diana, Princess of Wales, and Prince Harry play on the banks of the River Dee, near Balmoral Castle.during a Summer vacation, on August 18, 1987, in Balmoral, Scotland. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, with Prince Harry ( centre ), and her Niece's and Nephew's on holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via 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 - SEPTEMBER 12: (FILE PHOTO) Princess Diana with her sons Prince William and Prince Harry at Wetherby School on September 12, 1989 in London, England. It is Prince Harry's first day at school. (Photo by Anwar Hussein/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)
CHERTSEY, UNITED KINGDOM - APRIL 18: Diana, Princess of Wales, with Prince Harry, on the Depth Charge ride at Thorpe Park, Theme Park, on April 18, 1992 in Chertsey United Kingdom . (Photo by Julian Parker/UK Press via Getty Images)
LECH, AUSTRIA - APRIL 10: Princess Diana With Princes William & Harry Skiing In Lech, Austria (Photo by Tim Graham/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)
AUSTRIA - MARCH 30: Lech: Princess Diana, sons William and Harry going to restaurant in calash In Lech, Austria On March 30, 1993. (Photo by Laurent SOLA/Gamma-Rapho via Getty Images)
LECH, AUSTRIA - MARCH 27: Princess Diana With Prince William & Prince Harry In Sleigh During Ski Holiday In Lech, Austria. Behind Are Diana's Friends Kate Menzies And Catherine Soames (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - AUGUST 19: Princess Diana, Prince Harry [ Waving ] And Prince William Watching The Parade Of Veterans On V J Day, The Mall, London. Designer Of Diana's Suit - Tomasz Starzewski (please Check - People Magazine, 04/12/1999) (Photo by Tim Graham/Getty Images)
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess holding Prince William whilst pregnant with Prince Harry, and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess and Prince Harry on holiday and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
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"She realized there was life outside of palace walls and she wanted us to see that from a very young age," William says of his mother introducing him to her humanitarian work and opening their eyes to the world.

Of course, Diana's fairy-tale life nearly crumbled following her separation from husband Prince Charles. The divorce made her an even bigger target of the paparazzi. "I sadly remember the most she ever cried was to do with press intrusion," William says of family vacations ruined by cameras. "People would be utterly appalled if they knew what was going on."

"One lesson I've learned is you never let them in too far because it's very difficult to get them back out again," he says of keeping a distance between the cameras and his personal life.

13 PHOTOS
Prince William, Kate Middleton, George & Charlotte in Berlin
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Prince William, Kate Middleton, George & Charlotte in Berlin
Britain's Prince William, Duke of Cambridge (L) and his son Prince George arrive at the airport in Berlin on July 19, 2017. The British royal couple is on a three-day visit in Germany. / AFP PHOTO / POOL / Kay Nietfeld (Photo credit should read KAY NIETFELD/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge, his wife Kate, the Duchess of Cambridge and their children Prince George and Princess Charlotte arrive at the airport in Berlin on July 19, 2017. The British royal couple is on a three-day-visit in Germany. / AFP PHOTO / POOL / STEFFI LOOS (Photo credit should read STEFFI LOOS/AFP/Getty Images)
BERLIN, GERMANY - JULY 19: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at the Brandenburg Gate during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by DMC/GC Images)
Britain's Prince William, Duke of Cambridge, his wife Kate, the Duchess of Cambridge with their children Prince George and Princess Charlotte arrive at the Tegel irport in Berlin on July 19, 2017. The British royal couple is on a three-day visit in Germany. / AFP PHOTO / POOL / Kay Nietfeld (Photo credit should read KAY NIETFELD/AFP/Getty Images)
Britain's Prince William (R), Duke of Cambridge, his wife Kate, the Duchess of Cambridge with their children Prince George and Princess Charlotte arrive at the Tegel airport in Berlin on July 19, 2017. The British royal couple is on a three-day visit in Germany. / AFP PHOTO / dpa / Bernd Von Jutrczenka / Germany OUT (Photo credit should read BERND VON JUTRCZENKA/AFP/Getty Images)
BERLIN, GERMANY - JULY 19: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge arrive at Berlin Tegel Airport during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by Samir Hussein/WireImage)
BERLIN, GERMANY - JULY 19: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Prince George and Princess Charlotte arrive at Berlin's Tegel Airport during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by Karwai Tang/WireImage)
BERLIN, GERMANY - JULY 19: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George of Cambridge, Princess Charlotte of Cambridge arrive at Berlin airport during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by DMC/GC Images)
Prince George arriving at Berlin Airport in Germany.
The Duke of Cambridge and Prince George arriving at Berlin Airport in Germany.
Catherine, The Duchess of Cambridge greets people, at Brandenburg Gate in Berlin, Germany, July 19, 2017. REUTERS/Gregor Fischer/POOL
Prince William, the Duke of Cambridge and his wife Catherine, The Duchess of Cambridge visit Brandenburg Gate in Berlin, Germany, July 19, 2017. REUTERS/Axel Schmidt
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When it comes to her final days, both William and Harry regret not having taken full advantage of it before she died. "If I'd known now what was going to happen, I wouldn't have been so blasé about it," William says, referring to the last time he spoke to her. "Our phone call sticks in my mind quite heavily."

"I can't necessarily remember what I said. All I do remember is regretting for the rest of my life how short the phone call was," Harry recalls. "Looking back on it now is incredibly hard."

44 PHOTOS
Princess Diana and her fabulous travels
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Princess Diana and her fabulous travels
GIBRALTAR- AUGUST 01: Prince Charles, Prince of Wales and Princess Diana, Princess of Wales, wearing a Donald Campbell dress, leave for their honeymoon cruise on the Royal Yacht Britannia on August 01, 1981 in Gibraltar. (Photo by Anwar Hussein/Getty Images)
The Prince and Princess of Wales leave Gibraltar on the Royal Yacht Britannia for their honeymoon cruise, 1st August 1981. The Princess wears a Donald Campbell dress. (Photo by Tim Graham/Getty Images)
BALMORAL, UNITED KINGDOM - AUGUST 19: The Prince And Princess Of Wales On Their Honeymoon In Balmoral, Scotland (Photo by Tim Graham/Getty Images)
BALMORAL, UNITED KINGDOM - AUGUST 19: Prince Charles With His Arm Around Princess Diana As They Sit On A Style During Their Honeymoon At Balmoral In Scotland.the Princess Is Wearing A Suit Designed By Bill Pashley With A Pair Of Shoes By The Chelsea Cobbler. (Photo by Tim Graham/Getty Images)
15th June 1983: Charles, Prince of Wales, and Diana, Princess of Wales, (1961 - 1997) on holiday in Nova Scotia. (Photo by Central Press/Getty Images)
FRANCE - UNDATED: Princess Diana, Princess of Wales poses in a bikini whilst on holiday in the South of France. (Photo by Anwar Hussein/WireImage)
VIRGIN ISLANDS - UNDATED: Princess Diana, Princess of Wales enjoys a swim in the Virgin Islands. (Photo by Anwar Hussein/WireImage)
FRANCE: The Princess of Wales enjoys a swim in the South of France. (Photo by Anwar Hussein/WireImage) *** Local Caption ***
KLOSTERS, SWITZERLAND - FEBRUARY 1986: Princess Diana, Princess of Wales, wearing red ski gear and a red and white head band, enjoys a skiing holiday in Klosters, Switzerland in February 1986. (Photo by Anwar Hussein/WireImage)
(From left to Right) Prince Charles, Princess Diana, The Duchess of York Sarah Ferguson and The Duke of York Prince Andrew posing for photographers on their skiing holiday at the Swiss resort of Klosters. Wednesday 17th February 1987. (Photo by Kent Gavin/Mirrorpix/Getty Images)
KLOSTERS, SWITZERLAND - FEBRUARY 17: The Duchess Of York (sarah Ferguson) And Princess Diana Having Fun On Holiday In Klosters. (Photo by Tim Graham/Getty Images)
Members of the British Royal Family on a ski holiday, (L-R) Prince Charles, Prince Andrew, Princess Diana and the Duchess of York, in Grisons, Switzerland, February 17th 1987. (Photo by Tim Graham/Getty Images)
Princess Diana on a ski holiday in Klosters, Switzerland, February 6th 1986. (Photo by Tim Graham/Getty Images)
KLOSTERS, SWITZERLAND - FEBRUARY 06: Diana, Princess of Wales, wearing red ski gear and a red and white head band, enjoys a skiing holiday on February 06, 1986 in Klosters, Switzerland. (Photo by Anwar Hussein/Getty Images)
MAJORCA-AUGUST 10: (FILE PHOTO) Princess Diana, Princess of Wales with Prince William and Prince Harry on holiday in Majorca, Spain on August 10, 1987. Also present were the Spanish Royal Family and the Prince of Wales. (Photo by Anwar Hussein/Getty Images)
MAJORCA, SPAIN - AUGUST 08: Prince Charles And Princess Diana With Prince William And Prince Harry On Holiday In Majorca. Also Present Are Queen Sofia Of Spain And Infanta Elena. (Photo by Tim Graham/Getty Images)
PALMA, SPAIN - AUGUST 10: Diana, Princess of Wales poses with Queen Sofia of Spain during a summer holiday in Majorca on August 10, 1987 in Palma, Spain. (Photo by Anwar Hussein/Getty Images)
Princess Diana (1961 - 1997, left) with the Duchess of York during a skiing holiday in Klosters, Switzerland, 9th March 1988. (Photo by James Andanson/Sygma via Getty Images)
Left to right: the Duchess of York, Princess Diana (1961 - 1997) and Prince Charles during a skiing holiday in Klosters, Switzerland, 9th March 1988. (Photo by James Andanson/Sygma via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, with Prince Harry on holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, on holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, on Holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND - APRIL 11: Princess Diana In Leopardskin Swimming Costume And Sarong On Holiday In Necker Island In The Caribbean (Photo by Tim Graham/Getty Images)
The Prince and Princess of Wales holiday on a yacht with King Constantine II of Greece, 1990. (Photo by Georges De Keerle/Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - APRIL 11: Diana, Princess of Wales, with Prince William, on Holiday In Necker Island In The Caribbean, on April 11, 1990, in the British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
SPAIN - AUGUST 15: Princess Diana on holiday in Majorca with King Constantine of Greece and his daughter, Princess Theodora on the King's yacht, Fortuna. (Photo by Tim Graham/Getty Images)
MAJORCA, SPAIN - AUGUST 15: Princess Diana On Board The Yacht Fortuna On Summer Holiday In Majorca (Photo by Tim Graham/Getty Images)
MAJORCA, SPAIN - AUGUST 15: Diana, Princess of Wales, on board the yacht of King Juan Carlos of Spain 'Fortuna' on summer holiday on August 15, 1990 in Majorca, Spain (Photo by Georges De Keerle/Getty Images)
SAINT KITTS AND NEVIS - JANUARY 1993: Diana, The Princess of Wales walks in the sea on January 1993 in the Island of Nevis. (Photo by Julian Parker/UK Press via Getty Images)
Princess Diana (1961 - 1997) in the surf off the Island of Nevis, during a Caribbean holiday, 2nd January 1993.(Photo by Thierry Orban/Sygma via Getty Images)
SAINT KITTS AND NEVIS - JANUARY 1993: Diana, The Princess of Wales walks in the sea on January 1993 in the Island of Nevis. (Photo by Julian Parker/UK Press via Getty Images)
The Princess of Wales (C) watches for a wave while surfing at Indian Castle Beach 02 January 1993. Princess Diana is vacationing with her sons William and Harry. (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
SAINT KITTS AND NEVIS - JANUARY 1993: Diana, The Princess of Wales walks in the sea on January 1993 in the Island of Nevis. (Photo by Julian Parker/UK Press via 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)
GIZA, EGYPT - MAY 12: Diana Princess of Wales visits the Pyramids in Giza during an official tour of Egypt. (Photo by Tim Graham/Getty Images)
SAINT KITTS AND NEVIS - JANUARY 1993: Diana, The Princess of Wales walks in the sea on January 1993 in the Island of Nevis. (Photo by Julian Parker/UK Press via Getty Images)
LECH, AUSTRIA - MARCH 25: Diana, Princess Of Wales, On A Spring Ski-ing Holiday With Her Sons, Prince William And Prince Harry, And Her Friend Kate Menzies. (Photo by Tim Graham/Getty Images)
AUSTRIA - MARCH 26: Diana, Princess of Wales running whilst on a skiing holiday in Lech, Austria (Photo by Tim Graham/Getty Images)
Princess Diana (back row, R), along with her friends Kate Menzies (back row C) and Catherine Soames (back row, L), rides 26 August 1993 the Splash Mountain ride at Disney World's Magic Kingdom during the third day of their vacation. Front row left is Prince Harry, son of Princess Diana. Other passengers are unidentified. (Photo credit should read BOB PEARSON/AFP/Getty Images)
Photo taken on July 14, 1997 shows Britain's Lady Diana taken by an unidentified young girl for a jet-ski ride off the property of her friend Dodi Al-Fayed in Saint Tropez, on the French Riviera. Diana, Princess of Wales, and her companion, the Egyptian millionaire film-producer Dodi al-Fayed, died in Paris early 31 August after a midnight car crash. / AFP PHOTO / Patrick HERTZOG (Photo credit should read PATRICK HERTZOG/AFP/Getty Images)
Photo taken on July 14, 1997 shows Britain's Lady Diana taken by an unidentified young girl for a jet-ski ride off the property of her friend Dodi Al-Fayed in Saint Tropez, on the French Riviera. Diana, Princess of Wales, and her companion, the Egyptian millionaire film-producer Dodi al-Fayed, died in Paris early 31 August after a midnight car crash. / AFP PHOTO / Patrick HERTZOG (Photo credit should read PATRICK HERTZOG/AFP/Getty Images)
ST TROPEZ, FRANCE - JULY 17 1997: (FILE PHOTO) Diana, Princess of Wales and son HRH Prince William are seen holidaying with Dodi Al Fayed (not pictured) in St Tropez in the summer of 1997, shortly before Diana and Dodi were killed in a car crash in Paris on August 31, 1997. The inquests into both of their deaths are due to start in early 2004. (Photo by Michel Dufour/WireImage)
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As the documentary shifts focus to the princes' lives after Diana's death, William says "it spins you out ... but slowly you try to rebuild your life."

"People deal with grief in different ways and my way of dealing with it was shutting it out and locking it up," Harry says. "I went through a period of sorting myself out."

Now, both continue to keep Diana's legacy alive by continuing her humanitarian work and taking active roles in her biggest causes. For William that also means "constantly talking about Granny Diana" to his two kids, George and Charlotte, with wife Duchess Kate Middleton.

"I want to make enough time with George and Charlotte as I can," he says of learning from what his mother did for him and his brother.

"It has been hard and it will continue to be hard. There's not a day William and I don't wish she was around," Harry concludes.

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Kate and Charlotte together at Pippa Middleton's wedding
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Kate and Charlotte together at Pippa Middleton's wedding
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge, bridesmaid leave the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
Britain's Catherine, Duchess of Cambridge stands with her daughter Princess Charlotte, a bridesmaid, following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. REUTERS/Justin Tallis/Pool
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Princess Charlotte of Cambridge, bridesmaid and Catherine, Duchess of Cambridge attend the wedding Of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge speaks to Princess Charlotte after the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in in Englefield, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge speaks to Princess Charlotte after the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in in Englefield, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge leads the page boys and flower girls as they arrive for the wedding Of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge with Prince George of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
Britain's Catherine, Duchess of Cambridge (R) stands with her daughter Britain's princess Charlotte, a bridesmaid, following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. After turning heads at her sister Kate's wedding to Prince William, Pippa Middleton graduated from bridesmaid to bride on Saturday at a star-studded wedding in an English country church. The 33-year-old married financier James Matthews, 41, at a ceremony attended by the royal couple and tennis star Roger Federer, wearing a couture dress by British designer Giles Deacon. / AFP PHOTO / POOL AND AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge speaks to Princess Charlotte after the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in in Englefield, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge speaks to Princess Charlotte after the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in in Englefield, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge, with Prince George of Cambridge (R), page boy and Princess Charlotte of Cambridge (R), bridesmaid, after the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
TOPSHOT - Britain's Catherine, Duchess of Cambridge (R) walks with the bridesmaids and pageboys as they arrive for her sister Pippa Middleton's wedding to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. Pippa Middleton hit the headlines with a figure-hugging outfit at her sister Kate's wedding to Prince William but now the world-famous bridesmaid is becoming a bride herself. Once again, all eyes will be on her dress as the 33-year-old marries financier James Matthews on Saturday at a lavish society wedding where William and Kate's children will play starring roles. / AFP PHOTO / POOL AND AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge (L) stands with her daughter Britain's princess Charlotte, and the other bridesmaids and pageboys, as they await Pippa Middleton to arrive for her wedding to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. Pippa Middleton hit the headlines with a figure-hugging outfit at her sister Kate's wedding to Prince William but now the world-famous bridesmaid is becoming a bride herself. Once again, all eyes will be on her dress as the 33-year-old marries financier James Matthews on Saturday at a lavish society wedding where William and Kate's children will play starring roles. / AFP PHOTO / POOL AND AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Princess Charlotte of Cambridge, bridesmaid and Catherine, Duchess of Cambridge arrive for the wedding Of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
ENGLEFIELD, ENGLAND - MAY 20: Catherine, Duchess of Cambridge speaks to Princess Charlotte after the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge married hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte was in the wedding party, along with sister Kate and princes Harry and William. (Photo by Kirsty Wigglesworth - Pool/Getty Images)
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