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LONDON, UNITED KINGDOM - SEPTEMBER 06: Prince William And Prince Harry With Prince Charles Holding A Funeral Programme At Westminster Abbey For The Funeral Of Diana, Princess Of Wales (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - SEPTEMBER 06:  Prince William And Prince Harry With Prince Charles Holding A Funeral Programme  At Westminster Abbey For The Funeral Of Diana, Princess Of Wales  (Photo by Tim Graham Photo Library via Getty Images)

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The Princess of Wales' coffin, escorted by Coldstream Guards, in The Mall on the day of her funeral service, 6th September 1997. Her sons Princes William and Harry follow with their father Prince Charles, grandfather Prince Philip and Princess Diana's brother Earl Spencer. (Photo by Terry Fincher/Getty Images)

The Princess of Wales' coffin, escorted by Coldstream Guards, in The Mall on the day of her funeral service, 6th September 1997. Her sons Princes William and Harry follow with their father Prince Charles, grandfather Prince Philip and Princess Diana's brother Earl Spencer. (Photo by Terry Fincher/Getty Images)

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A line of princes following the Princess of Wales' coffin after the funeral service at Westminster Abbey, 6th September 1997. From left to right, Prince Philip, Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry and Prince Charles, Prince of Wales. (Photo by Jayne Fincher/Getty Images)

A line of princes following the Princess of Wales' coffin after the funeral service at Westminster Abbey, 6th September 1997. From left to right, Prince Philip, Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry and Prince Charles, Prince of Wales. (Photo by Jayne Fincher/Getty Images)