From a Washington Post story by Dave Kindy headlined “A surprising number of celebrities have worked as spies”:

During World War II, Josephine Baker regularly attended parties at embassies and consulates in occupied France, where she would flirt with high-ranking Nazi officials. Because of her celebrity as a dancer, actor and singer, the German men would swoon over her — and sometimes begin to divulge military secrets after being plied with alcohol.

Baker would later jot down notes and hide them where she hoped no one would find them: in her underwear. In her 1977 autobiography “Josephine,” she wrote how those secrets were “snugly in place, secured by a safety pin,” so they could be carried past checkpoints and delivered to the French Resistance.