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American actress and Princess of Monaco, Grace Kelly (1929-1982) pictured wearing a blue evening dress with halterneck in Monte Carlo circa 1968. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

American actress and Princess of Monaco, Grace Kelly (1929-1982) pictured wearing a blue evening dress with halterneck in Monte Carlo circa 1968. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)