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LONDON, ENGLAND - MARCH 19: Diana, Princess of Wales, wearing a green velvet dress designed by Victor Edelstein and an emerald choker necklace, kisses her father-in-law, Prince Philip, Duke of Edinburgh on the cheek as she arrives to attend a dinner at the Royal Society of Arts on March 19, 1986 in London, United Kingdom. (Photo by Anwar Hussein/Getty Images)

LONDON, ENGLAND - MARCH 19: Diana, Princess of Wales, wearing a green velvet dress designed by Victor Edelstein and an emerald choker necklace, kisses her father-in-law, Prince Philip, Duke of Edinburgh on the cheek as she arrives to attend a dinner at the Royal Society of Arts on March 19, 1986 in London, United Kingdom. (Photo by Anwar Hussein/Getty Images)