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LONDON, UNITED KINGDOM - JULY 29: Diana, Princess of Wales, wearing an Emanuel wedding dress, leaves St. Paul's Cathedral with Prince Charles, Prince of Wales following their wedding on 29 July, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)

LONDON, UNITED KINGDOM - JULY 29:  Diana, Princess of Wales, wearing an Emanuel wedding dress, leaves St. Paul's Cathedral with Prince Charles, Prince of Wales following their wedding on 29 July, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)

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The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. The couple leave the cathedral after the ceremony. (Photo by Fox Photos/Hulton Archive/Getty Images)

The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. The couple leave the cathedral after the ceremony. (Photo by Fox Photos/Hulton Archive/Getty Images)

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Newlyweds Prince Charles and Princess Diana waving to the crowds on the way to Buckingham Palace after their wedding ceremony, London, 29th July 1981. (Photo by Keystone/Hulton Archive/Getty Images)

Newlyweds Prince Charles and Princess Diana waving to the crowds on the way to Buckingham Palace after their wedding ceremony, London, 29th July 1981. (Photo by Keystone/Hulton Archive/Getty Images)

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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)

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)

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The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. (Photo by Keystone/Hulton Archive/Getty Images)

The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. (Photo by Keystone/Hulton Archive/Getty Images)