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CANNES - MAY 15: Princess Diana, Princess of Wales, wearing a pale blue chiffon dress and matching stole by Catherine Walker, and Prince Charles, Prince of Wales attend Cannes film festival on May 15, 1987 in Cannes, France (Photo by Anwar Hussein/Getty Images)

CANNES - MAY 15: Princess Diana, Princess of Wales, wearing a pale blue chiffon dress and matching stole by Catherine Walker, and Prince Charles, Prince of Wales attend Cannes film festival on May 15, 1987 in Cannes, France (Photo by Anwar Hussein/Getty Images)