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LONDON, UNITED KINGDOM - JULY 23: Prince William (R) sits in Westmister Abbey for the wedding of Prince Andrew, Duke of York to Sarah Ferguson, Duchess of York on July 23, 1986 in London, England. (Photo by Anwar Hussein/Getty Images)

LONDON, UNITED KINGDOM - JULY 23: Prince William (R) sits in Westmister Abbey for the wedding of Prince Andrew, Duke of York to Sarah Ferguson, Duchess of York on July 23, 1986 in London, England. (Photo by Anwar Hussein/Getty Images)

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On the balcony of Buckingham Palace, Sarah, Duchess of York and Prince Andrew, Duke of York kiss each other after their wedding, London, England, July 23, 1986. Among those with them on the balcony are Sarah's mother, Susan Barrantes (1937 - 1998) (left, in yellow), Peter Philips (bottom left), best man (and brother of the groom) Prince Edward, Earl of Wessex (right rear), Queen Elizabeth the Queen Mother (1900 - 2002) (right), and Prince William, Duke of Cambridge (far right). (Photo by Derek Hudson/Getty Images)

On the balcony of Buckingham Palace, Sarah, Duchess of York and Prince Andrew, Duke of York kiss each other after their wedding, London, England, July 23, 1986. Among those with them on the balcony are Sarah's mother, Susan Barrantes (1937 - 1998) (left, in yellow), Peter Philips (bottom left), best man (and brother of the groom) Prince Edward, Earl of Wessex (right rear), Queen Elizabeth the Queen Mother (1900 - 2002) (right), and Prince William, Duke of Cambridge (far right). (Photo by Derek Hudson/Getty Images)

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LONDON, UNITED KINGDOM - JUNE 17: Queen Elizabeth II stands on the balcony of Buckingham Palace at the Trooping the Colour ceremony with (from left) Lord Frederick Windsor, Prince Michael of Kent, Princess Margaret, Prince Harry, Princess Alexandra, Diana, Princess of Wales, Prince William, Prince Charles, Prince of Wales, Prince Philip, Duke of Edinburgh, Prince Andrew, Duke of York, Sarah, Duchess of York and Queen Elizabeth, the Queen Mother on June 17, 1989 in London, England. (Photo by Anwar Hussein/Getty Images)

LONDON, UNITED KINGDOM - JUNE 17: Queen Elizabeth II stands on the balcony of Buckingham Palace at the Trooping the Colour ceremony with (from left) Lord Frederick Windsor, Prince Michael of Kent,  Princess Margaret, Prince Harry, Princess Alexandra, Diana, Princess of Wales, Prince William, Prince Charles, Prince of Wales, Prince Philip, Duke of Edinburgh, Prince Andrew, Duke of York, Sarah, Duchess of York and Queen Elizabeth, the Queen Mother on June 17, 1989 in London, England. (Photo by Anwar Hussein/Getty Images)

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LONDON - JULY 23: Queen Elizabeth II and Prince William surrounded by family and friends bid farewell to the Duke and Duchess of York as they set off on honeymoon after their wedding on July 23rd 1986. in London, England. (Photo by Anwar Hussein/Getty Images)

LONDON - JULY 23: Queen Elizabeth II and Prince William surrounded by family and friends bid farewell to the Duke and Duchess of York as they set off on honeymoon after their wedding on July 23rd 1986. in London, England. (Photo by Anwar Hussein/Getty Images)