Teenage singer Cheryl Williams (Jane Powell) tries hard to to prove to her classmates that her older sister, Josephine (Constance Moore), is really the Broadway actress she claims to be. Believing Josephine's fabricated stories, Cheryl is crushed to discover her sister is actually a performer in a bawdy burlesque house. But, when the siblings meet theatrical impresario Arthur Hale (Ralph Bellamy), he promises to make them both stars, and falls for Josephine in the process.