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NEW ZEALAND - APRIL 20: Princess Diana At A Banquet In New Zealand Wearing A Blue Chiffon Evening Dress Designed By Fashion Designers David And Elizabeth Emanuel (the Emanuels). (Photo by Tim Graham Photo Library via Getty Images)

NEW ZEALAND - APRIL 20:  Princess Diana At A Banquet In New Zealand Wearing A Blue Chiffon Evening Dress Designed By Fashion Designers David And Elizabeth Emanuel (the Emanuels).  (Photo by Tim Graham Photo Library via Getty Images)