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LONDON, UNITED KINGDOM - NOVEMBER 04: Princess Diana At The Victoria And Albert Museum For The Splendours Of The Gonzagas Exhibition Gala Wearing A Pale Blue Chiffon Evening Dress Designed By Fashion Designers Bellville Sassoon. The Princess Seemed Tired During The Event And The Following Day The Palace Announced Her Pregnancy. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 04:  Princess Diana At The Victoria And Albert Museum For The Splendours Of The Gonzagas Exhibition Gala Wearing A Pale Blue Chiffon Evening Dress Designed By Fashion Designers Bellville Sassoon.  The Princess Seemed Tired During The Event And  The Following Day The Palace Announced Her  Pregnancy.  (Photo by Tim Graham Photo Library via Getty Images)