Stardust.

Carla de Hulvea is a rumba dancer who makes news by posing as a South-American heiress. She is doing fine with her hoax until she meets American Peter Jackson, a high-pressure promoter who is looking for movie-producing money. He does some big-time bluffing on his own in order to get Carla to invest in a film he is making with his partner, Roy Harley. Through Carla, Roy meets actress Diana West, who is given a role in the movie, and Roy falls in love with her.