Ethel Merman
Molly Donahue

Marilyn Monroe
Vicky

Mitzi Gaynor
Katy Donahue

Dan Dailey
Terence Donahue

Donald O'Connor
Tim Donahue

Johnnie Ray
Steve Donahue

Richard Eastham
Lew Harris

Hugh O'Brian
Charles Gibbs

Frank McHugh
Eddie Dugan

Rhys Williams
Father Dineen

Lee Patrick
Marge

Eve Miller
Helen

Dorothy Abbott
Showgirl (uncredited)

Lyle Talbot
Stage Manager (uncredited)

George Chakiris
Dancer (uncredited)

John Doucette
Stage Manager (uncredited)

Alvy Moore
Katy's Date (uncredited)

Ron Nyman
Tattooed Sailor (uncredited)

Walter Winchell
Walter Winchell (voice) (uncredited)

Dorothy Adams
Nurse (uncredited)

Robin Raymond
Lillian Sawyer (uncredited)