Prince Charles had affair with Barbra Streisand -- and Diana knew, book claims

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Diana Knew About Prince Charles' Affair with Barbra Streisand, Book Claims

A new book claims that Britain's Prince Charles had a secret love affair with Barbra Streisand – and Princess Diana knew all about it.

Christopher Andersen, the best-selling author of "Game of Crowns: Elizabeth, Camilla, Kate and the Throne," says Charles had long admired the singer.

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"Charles as a young man had an immense crush on Barbra Streisand," he told INSIDE EDITION. "Even at Cambridge University he had a poster of Barbra Streisand on the wall of his room."

In 1974, Charles even visited the set of the movie, Funny Girl, where he spent 20 minutes with the star. But Andersen claims it was another two decades before their first tryst.

"Flash forward 20 years, he's back in Los Angeles and they had a secret rendezvous at the Bel Air Hotel that no one knows about," Andersen said.

One person knew though, he added.

RELATED: Princess Diana's life in photos:

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Princess Diana's life in photos
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Prince Charles had affair with Barbra Streisand -- and Diana knew, book claims
Princess Diana wearing a tiara and diamond necklace on an official visit to Australia, April 12th 1983. (Photo by Tim Graham/Getty Images)
Family album picture of Lady Diana Spencer at Itchenor, West Sussex, during the summer of 1970. (AP Photo)
Lady Diana Spencer, 21, Prince Charles's girlfriend, is pictured in 1980 at the Kindergarten in St. Georges Square, Pimlico, London, where she works as a teacher. Diana, youngest of 56-year-old Lord Spencer's five children, would not talk about her friendship with Prince Charles, although it is known they have been on dates and she has stayed with the Royal Family at Balmoral. (AP-Photo)
This is a Feb. 24, 1981 file photo of Britain's Prince Charles and the then-Lady Diana Spencer on the grounds of Buckingham Palace after announcing their engagement. According to the British news agency, Diana, Princess of Wales has died following a car accident in Paris, France, Sunday Aug. 31, 1997. (AP Photo/Ron Bell/Pool)
Prince Charles and his bride-to-be, Lady Diana Spencer, driving down the course in an open carriage before Royal Ascot in England meeting on June 19, 1981. (AP Photo/Press Association)
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)
Prince Charles looks at his beaming bride, the Princess of Wales, at the top of St. Paul’s steps after their marriage in London on July 29, 1981. (AP Photo/Press Association) UK Out
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)
FILE - In this July 29, 1981 file photo, Britain's Prince Charles kisses his bride, the former Diana Spencer, on the balcony of Buckingham Palace in London, after their wedding. Sony Electronics and the Nielsen television research company collaborated on a survey ranking TV's most memorable moments. Other TV events include, the Sept. 11 attacks in 2001, Hurricane Katrina in 2005, the O.J. Simpson murder trial verdict in 1995 and the death of Osama bin Laden in 2011. (AP Photo, file)
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)
The Princess of Wales (formerly Lady Diana Spencer) smiles as she talks with the Commander of her Household Cavalry escort, Andrew Parker-Bowles, as she and the Prince of Wales leave Buckingham Palace in London for Waterloo Station to begin their honeymoon on July 29, 1981. (Press Association via AP Images)
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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"Something was going on and Diana knew all about it," he said.

The book also lays out the bitter rivalries between the powerful women in the British royal family. While it's all smiles for the cameras, behind the scenes it's more like "Game of Thrones," according to Andersen, a journalist who has authored more than 30 books.

"Great wealth, power, secrets, tragedy, scandal it's all there in the royal family," he said.

Most recently, Kate, the Duchess of Cambridge, has shown her power and even upstaged the Queen at a royal event by wearing a scarlet outfit, Andersen said.

"Neither Camilla or the Queen was pleased that they were so dramatically upstaged," he said. "This is the kind of thing that goes on all the time, though."

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A look back at British Royals visiting the USA, Princess Diana, Prince Harry, Prince Charles, Camilla, Queen Elizabeth, Royal Family, Kate, William,
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Prince Charles had affair with Barbra Streisand -- and Diana knew, book claims
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)
LONDON - JULY 29: Prince Charles, Prince of Wales and Princess Diana, Princess of Wales, kiss on the balcony of Buckingham Palace following their wedding on July 29, 1981 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON, UNITED KINGDOM - JULY 29: Lady Diana Spencer With Her Father, Earl Spencer (left), And Her Husband, Prince Charles, During Their Wedding Ceremony In St Paul's Cathedral, London. (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)
UNITED KINGDOM - JANUARY 01: England, Lady Diana And Prince Charles (Photo by Keystone-France/Gamma-Keystone via Getty Images)
LONDON, UNITED KINGDOM - JUNE 22: Prince And Princess Of Wales Leaving The Lindo Wing Of St Mary's Hospital With Their First Baby Son, Prince William. (Photo by Tim Graham/Getty Images)
AUCKLAND, NEW ZEALAND - APRIL 18: Princess Diana, Princess of Wales and Prince Charles, Prince of Wales play with their baby son Prince William in the gardens of Government House on April 18, 1983 in Auckland, New Zealand. (Photo by Anwar Hussein/Getty Images)
AUSTRALIA - APRIL 14: Prince Charles, Prince of Wales and Diana, Princess of Wales meet actor Paul Hogan at the Melbourne Concert Hall (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 17: Prince Charles & Princess Diana With The Newly Born Prince Henry (harry) Outside The Lindo Wing. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles And Princess Diana Kissing On The Balcony Of Buckingham Palace On Their Wedding Day. (l To R) Lord Nicholas Windsor, Edward Van Cutsem, Sarah Jane Gaselee, Catherine Cameron, Princess Diana, Prince Charles Clementine Hambro And Queen Elizabeth Ll. The Princess Is Wearing A Wedding Dress Designed By David And Elizabeth Emanuel. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles And Princess Diana Being Driven In An Open Carriage From St Paul's Cathedral To Buckingham Palace. They Are Escorted By The Household Cavalry. Policemen Line The Streets To Keep The Huge Crowds Under Control. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: The Wedding Of The Prince And Princess Of Wales At St Paul's Cathedral In London (Photo by Tim Graham/Getty Images)
29th July 1981: Charles, Prince of Wales and Diana, Princess of Wales (1961 - 1997) in the throne room of Buckingham Palace, after their wedding at St Paul's Cathedral, London. (Photo by Keystone/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles Whispering To Princess Diana On Their Wedding Day As They Appear On The Balcony Of Buckingham Palace (Photo by Tim Graham Picture Library/Getty Images)
29th July 1981: Charles, Prince of Wales, with his wife, Princess Diana (1961 - 1997), at the altar of St Paul's Cathedral during their marriage ceremony. (Photo by Hulton Archive/Getty Images)
29th July 1981: Charles, Prince of Wales and Diana, Princess of Wales (1961 - 1997), waving to crowds from the balcony of Buckingham Palace, London after their wedding. (Photo by Fox Photos/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: (l To R) Prince Andrew, The Queen Mother, Earl Spencer, Queen Elizabeth Ll, Princess Diana And Prince Charles On The Balcony Of Buckingham Palace On The Wedding Day Of The Prince And Princess Of Wales. (Photo by Tim Graham/Getty Images)
LONDON - JULY 29: Diana, Princess of Wales and Prince Charles emerge from St. Paul's Cathedral after their wedding July 29, 1981 in London, England. (Photo by Anwar Hussein/WireImage)
AUCKLAND, NEW ZEALAND - APRIL 01: Prince William is seen with his parents HRH Prince Charles and the late Princess Diana (wearing Vanvelden puritan collar) during their 1983 official visit to New Zealand, in April 1983 in Auckland, New Zealand. (Photo by Anwar Hussein/WireImage)
WASHINGTON, UNITED STATES - NOVEMBER 11: (L To R) Prince Charles, Prince of Wales, Princess Diana, Princess of Wales, Vice-President George Bush and his wife Barbara Attending A Dinner At The British Embassy In Washington, USA. Diana's Dress Is By Fashion Designer Murray Arbeid. (Photo by Tim Graham/Getty Images)
Princess Diana (Photo by Ron Galella/WireImage)
Princess Diana during Dawson International Cocktail Party - February 1, 1989 at The Equitable Center in New York City, New York, United States. (Photo by Ron Galella/WireImage)
The Princess of Wales, wearing a Catherine Walker suit, surrounded by security while visiting the Henry Street settlement in New York City, February 1989. (Photo byTerry Fincher/Getty Images)
Abe Beam, HM Queen Elizabeth II and Prince Philip, Duke of Edinburgh (Photo by Ron Galella/WireImage)
UNITED STATES - FEBRUARY 02: Princess Diana stands for the National Anthem at Brooklyn Academy of Music, where the Welsh National Opera is putting on Verdi's 'Falstaff.' , (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - FEBRUARY 02: Britain's Princess Diana is all smiles as she arrives in New York City, for a three day visit. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - FEBRUARY 02: Diana, Princess of Wales wears a dress designed by Victor Edelstein to the Brooklyn Academy of Music to see the Welsh National Opera Gala production of 'Falstaff' (Photo by Tim Graham/Getty Images)
UNDATED: Prince Charles, Princess of Wales and Princess Diana, Princess of Wales. (Photo by Anwar Hussein/WireImage)
MELBOURNE - 1985: A 1985 photo of Princess Diana, Princess of Wales, in a David Emanuel dress and Prince Charles, Prince of Wales, dancing in Melbourne. British designer Emanuel designed the princess's wedding dress. (Photo by Anwar Hussein/WireImage)
1980: Children's nanny, Lady Diana Spencer with two of her charges, the year before she married Prince Charles and became the Princess of Wales. (Photo by Hulton Archive/Getty Images)
Sport, Horse Racing, The Grand National, Aintree, Liverpool, England, Circa 1980's, HRH the Prince of Wales (Charles) is pictured with his wife Diana the Princess of Wales (Photo by Bob Thomas/Getty Images)
Lady Diana Spencer and Prince Charles, Prince of Wales pose for photographs in the grounds of Buckingham Palace following the announcement of their engagement, 24th February 1981. (Photo by John Downing/Getty Images)
LONDON - FEBRUARY 24: Princess Diana, Princess of Wales and Prince Charles, Prince of Wales pose outside Buckingham Palace as they announce their engagement on February 24, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 24: Lady Diana Spencer (later To Become Princess Diana) With Prince Charles Arm In Arm At Buckingham Palace On The Day Of The Announcement Of Their Engagement. She Is Wearing A Royal Blue Suit By Designer Cojana Reported To Have Been Bought From Harrods (Photo by Tim Graham/Getty Images)
GREAT BRITAIN - FEBRUARY 24: Lady Diana Spencer (later to become Princess of Wales) reveals her sapphire and diamond engagement ring while she and Prince Charles, Prince of Wales pose for photographs in the grounds of Buckingham Palace following the announcement of their engagement (Photo by Tim Graham/Getty Images)
Diana, Princess of Wales (1961 - 1997) with Prince Charles, London, circa 1981. (Photo by Kypros/Getty Images)
UNITED KINGDOM - MAY 06: Prince Charles, Prince of Wales with his fiance Lady Diana Spencer during a photocall before their wedding while staying at Craigowan Lodge on the Balmoral Estate in Scotland (Photo by Tim Graham/Getty Images)
10th March 1981: Charles, Prince of Wales and Diana, Princess of Wales (1961 - 1997), arriving at a banquet held in Goldsmith's Hall, London. (Photo by Keystone/Hulton Archive/Getty Images)
Prince Charles and Diana, Princess of Wales (1961 -1997) leave Buckingham Palace for their honeymoon after their wedding, London, 29th July 1981. (Photo by Serge Lemoine/Hulton Archive/Getty Images)
BALMORAL, UNITED KINGDOM - AUGUST 19: Prince Charles, Prince of Wales with his arm around Princess Diana, Princess of Wales as they sit on a style during their honeymoon at Balmoral in Scotland.The Princess is wearing a suit designed by Bill Pashley. (Photo by Tim Graham/Getty Images)
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)
GIBRALTAR - AUGUST 01: Prince Charles, Prince of Wales with Diana, Princess of Wales on the Royal Yacht Britannia at the start of their honeymoon cruise, Her outfit is designed by Donald Campbell (Photo by Tim Graham/Getty Images)
Prince Charles and Diana, Princess of Wales (1961 - 1997) leave Eastleigh airport in Hampshire at the start of their honeymoon, August 1981. She is wearing a Donald Campbell dress. (Photo by Kypros/Getty Images)
CHELTENHAM, UNITED KINGDOM - MARCH 17: Princess Diana Pregnant And Prince Charles At Cheltenham Races (Photo by Tim Graham/Getty Images)
BRAEMAR, SCOTLAND - SEPTEMBER 04: The Queen, Princess Diana And Prince Charles Watching The Traditional Highland Games At Braemar In Scotland. (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)
AUSTRALIA - MARCH 29: Prince Charles And Princess Diana Holding Hands While Watching A Diplay In Australia (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles arrive for a state reception in Hobart, Tasmania, 30th March 1983. The princess is wearing the Spencer family tiara and a dress by Bruce Oldfield. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
AUSTRALIA - MARCH 20: Prince Charles And Princess Diana With Prince William Visiting Australia On Her First Overseas Tour. (Photo by Tim Graham/Getty Images)
UNITED KINGDOM - FEBRUARY 01: Prince Charles, Prince of Wales and Diana, Princess of Wales with their baby son, Prince William, at home in Kensington Palace (Photo by Tim Graham/Getty Images)
AUCKLAND, NEW ZEALAND - APRIL 23: The Prince and Princess of Wales with their son, Prince William during a visit to Auckland, New Zealand. (Photo by Tim Graham/Getty Images)
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And with the Queen celebrating her 90th birthday this week, Andersen says there's a secret plan – codenamed, "London Bridge" – to allow Prince William to become king while he's still relatively young.

"This master plan calls for the Queen to step aside," he said. "Charles takes the throne and agrees to reign for 15 years. He steps aside and allows William and Kate to take the throne in their mid-forties."

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