Ethel Merman character Molly Donahue
Marilyn Monroe character Vicky
Mitzi Gaynor character Katy Donahue
Dan Dailey character Terence Donahue
Donald O'Connor character Tim Donahue
Johnnie Ray character Steve Donahue
Richard Eastham character Lew Harris
Hugh O'Brian character Charles Gibbs
Frank McHugh character Eddie Dugan
Rhys Williams character Father Dineen
Lee Patrick character Marge
Eve Miller character Helen
Dorothy Abbott character Showgirl (uncredited)
Lyle Talbot character Stage Manager (uncredited)
George Chakiris character Dancer (uncredited)
John Doucette character Stage Manager (uncredited)
Alvy Moore character Katy's Date (uncredited)
Ron Nyman character Tattooed Sailor (uncredited)
Walter Winchell character Walter Winchell (voice) (uncredited)
Dorothy Adams character Nurse (uncredited)
Robin Raymond character Lillian Sawyer (uncredited)
