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Based upon a hit German musical that had already been filmed in 1934, Who's Your Lady Friend? emerged as a British comedy-with-music in 1937. Dr. Mangold (played by Vic Oliver, a popular dance-band leader of the day) is a famous Viennese "beauty specialist" (i.e., plastic surgeon), saddled with a rather incompetent secretary named Fred (Romney Brent). Expecting an extremely important new client from France, Dr. Mangold makes the mistake of sending Fred to the station to pick her up. Due to a mix-up about identities, Fred instead returns with a vixenish cabaret singer named Lulu (Frances Day). To add to the complications and misunderstandings, Fred's fiancée Mimi (Margaret Lockwood) sees him out with the beautiful singer and leaps to the conclusion that he is being unfaithful to her. At the same time, Mrs. Mangold (Betty Stockfield) assumes that her husband, the doctor, has also succumbed to Lulu's wiles. Matters are not made any better when Fred goes on a bender and somehow ends up in the same bed as Mrs. Mangold. Eventually, everything is cleared up and the couples reunite happily. The score features the minor hit "Moonlight and Music", and the character of the maid is played by Sarah Churchill, daughter of Winston Churchill and wife of Vic Oliver.