To save his career, an ad man wants a sex symbol to endorse a lipstick but in exchange, she wants him to pretend to be her lover.

Georgia Garrett is sent by jealous wife Elvira Kent on an ocean cruise to masquerade as herself while she secretly stays home to catch her husband cheating. Meanwhile equally suspicious husband Michael Kent has sent a private eye on the same cruise to catch his wife cheating. Love and confusion ensues along with plenty of musical numbers.