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LONDON, UNITED KINGDOM - JULY 01: Cards And Balloons For Diana, Princess Of Wales At The Tate Gallery On Her 36th Birthday On (1st July 1997) For A Gala To Celebrate The Tate's 100th Birthday. She is Wearing A Black Evening Dress By Jacques Azagury. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - JULY 01:  Cards And Balloons For Diana, Princess Of Wales At The Tate Gallery On Her 36th Birthday On (1st July 1997) For A Gala To Celebrate The Tate's 100th Birthday. She is Wearing A Black Evening Dress By  Jacques Azagury.  (Photo by Tim Graham Photo Library via Getty Images)