Simone Simon(1911-2005)

Had an affair with a famous WWII spy, Dusko Popov, who was Yugoslavian and thought by the Germans to be a spy for them but in fact was a spy for the British. Popov was a very successful double agent and a well-known ladies man, and during WWII was also acquainted with another spy, Ian Fleming, who later worked aspects of Popov into his James Bond. It sounds like a movie in itself but it's completely true.