In 1904, Uncle Latsie (S.Z. Sakall) comes to New York from Hungary with two little nieces, Jenny (Betty Grable) and Rosie (June Haver) who immediately take to cafe dancing. In 1912, they're still at it, but to pay Uncle's card debts they decide to go into vaudeville. They meet another up-and-coming act, singer Harry Fox (John Payne (actor)). Jenny falls in love with him.