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.

Princess Diana carrying her son, Prince William and Prince Charles carrying their other boy, Prince Harry, leave the grounds of Buckingham Palace on July 23, 1986 after the Duke and Duchess of York were married.

Prince William makes 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 on June 15, 1985 in London.

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.

Members of the British Royal Family sit for an official portrait in the white drawing room at Windsor Castle after Prince William's confirmation at St Georges Chapel March 9. Pictured are, (Left to Right Front Row) Prince Harry, Diana Princess of Wales, Prince William, the Prince of Wales, Queen Elizabeth, (back row Left to Right) King Constatine of Greece, Lady Susan Hussey, Princess Alexandra, the Duchess of Westminster, and Lord Romsey. BRITAIN

FILE PHOTO 19AUG95 - Princess Diana and Prince Charles, with their sons Prince Harry (L) and Prince William, stand outside Buckingham Palace August 19, 1995 during Britain's VJ (Victory over Japan) Day commemoration service. Diana, who was divorced from Charles in 1996, and her millionaire companion Dodi Al Fayed were killed early Sunday when their car crashed while reportedly being chased through Paris by photographers on motorcycles. FRANCE DIANA

FILE PHOTO APRIL 92 - After the announcement of the separation between [Princess Diana and the Prince of Wales], there was a speculation that their eldest son Prince William (seen here at an Eastern Sunday Service) would take the throne, which proved wrong.