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)