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LONDON, UNITED KINGDOM - DECEMBER 04: Diana, Princess Of Wales, Attending The Diamond Ball At The Royal Lancaster Hotel In Aide Of The Charity Sane Of Which Her Husband Is Patron. The Princess Is Wearing A Dress Designed By Catherine Walker. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 04:  Diana, Princess Of Wales, Attending The Diamond Ball At The Royal Lancaster Hotel In Aide Of The Charity Sane Of Which Her Husband Is Patron.  The Princess Is Wearing A Dress Designed By Catherine Walker.  (Photo by Tim Graham Photo Library via Getty Images)