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RIYADH, SAUDI ARABIA - NOVEMBER 1: Princess Diana, wearing a Catherine Walker outfit, attends a picnic in the desert near Riyadh, Saudi Arabia on November 1, 1986 (Photo by David Levenson/Getty Images)

RIYADH, SAUDI ARABIA - NOVEMBER 1: Princess Diana, wearing a Catherine Walker outfit, attends a picnic in the desert near Riyadh, Saudi Arabia on November 1, 1986 (Photo by David Levenson/Getty Images)