Unfaithfully Yours is a 1984 American romantic comedy film directed by Howard Zieff, starring Dudley Moore and Nastassja Kinski and featuring Armand Assante and Albert Brooks. The screenplay was written by Valerie Curtin, Barry Levinson, and Robert Klane based on Preston Sturges' screenplay for the 1948 film of the same name. The original music score is by Bill Conti and the song "Unfaithfully Yours (One Love)" was written for the film and performed by Stephen Bishop.

Plot

Claude Eastman is a composer and the conductor of a prestigious symphony who has recently married beautiful Daniella, a much younger woman. While traveling, he sends a message to his friend Norman Robbins to keep an eye on his wife, but the message is garbled by Claude's Italian valet Giuseppe, and Norman hires a private detective named Keller to investigate Daniella.