Grable began her film career in 1929 at age 12, after which she was fired from a contract when it was learned she signed up under false identification. She had contracts with RKO and Paramount Pictures during the 1930s, and appeared in a string of B movies, mostly portraying college students. Grable came to prominence in the Broadway musical DuBarry Was a Lady (1939), which brought her to the attention of 20th Century-Fox.