Myrna Loy was one of the most successful stars of the 1930s, being crowned the Queen of Hollywood in 1938 (opposite Clark Gable, who received the miter and scepter of the King of Hollywood). Her amicable on-screen persona (which earned her honors as the "perfect wife") was matched by the all-around awesomeness of her actual self--she made only one movie during World War II, as she was working full-time for the Red Cross (she had previously been blacklisted by Adolf Hitler for denouncing him). She was also a proponent of the civil rights movements of the 1960s, and opposed the anti-Communist witch hunt of McCarthy and the House Unamerican Activities Committee in the 1950s.
Also, she was hot. Let's not forget that ever-so-important detail, shall we?