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Belle of the Nineties is a 1934 American Western film directed by Leo McCarey and released by Paramount Pictures. Mae West's fourth motion picture, it was based on her original story It Ain't No Sin, which was also to be the film's title until censors objected. Johnny Mack Brown, Duke Ellington, and Katherine DeMille are also in the cast. The film is noted for being the premiere performance of the jazz standard "My Old Flame", performed by West with the Duke Ellington Orchestra.