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Karl, a German diplomat in Paris, discovers that his fiancee, Diane, has been cheating on him. He tells her that he would rather marry a "girl of the streets" than her. Outraged, Diane decides to grant his wish, and enlists the services of a Spanish singer/dancer from a disreputable nightclub to pose as a sophisticated, convent-educated singer, and surreptitiously arranges for her to meet Karl.