'As Long as They're Happy' can be described as a romantic comedy with song-and-dance interludes. Adapted from the London stage hit of the same name, the film stars Jack Buchanan as stockbroker John Bentley, whose household is thrown into a tizzy when popular singing star Bobby Denver (Jerry Wayne) visits his home. Bentley's three daughters Gwen (Janette Scott), Pat (Jeannie Carson) and Corinne (Susan Stephen) are immediately smitten by Bobby, though each reacts to his presence in a different manner. Mrs. Bentley (Brenda de Banzie), hoping to loosen up her staid hubby, pretends to be likewise enamored with the singer. The film did the most amount of good for recording artist Jeannie Carson, who landed her own American TV sitcom as a result of her appearance herein. Also well cast in 'As Long as They're Happy' are sex-symbol Diana Dors in an extended cameo role, and 'Carry On' regular Joan Sims as a comic maid.