Let's Make It Legal is a 1951 American comedy film made by Twentieth Century-Fox, directed by Richard Sale and produced by Robert Bassler from a screenplay by I.A.L. Diamond and F. Hugh Herbert, based on a story by Mortimer Braus entitled "My Mother-in-Law, Miriam". The music was by Cyril J. Mockridge and the cinematography by Lucien Ballard. The film stars Claudette Colbert, Macdonald Carey, Zachary Scott, Barbara Bates, and Marilyn Monroe.