Jeanette MacDonald
— Louise Rayton Morgan
José Iturbi
— Himself
Jane Powell
— Tess Morgan
Edward Arnold
— Robert Nelson
Harry Davenport
— Dr. Cannon
Moyna MacGill
— Mrs. Smith
Elinor Donahue
— Alix Morgan
Ann E. Todd
— Ilka Morgan
Tom Helmore
— Michael Pemberton
Kathryn Card
— Jonesy
Dick Simmons
— Mr. Harlow, Nelson's Secretary
Larry Adler
— Himself (Harmonica Player)
Amparo Iturbi
— Herself
Anita Aros
— Switchboard Operator (uncredited)
Don Avalier
— Headwaiter (uncredited)
Amparo Ballester
— Cigarette Girl (uncredited)
Nina Bara
— Cuban Singer (uncredited)
Leon Belasco
— Ship Bandleader (uncredited)
Nan Bennett
— Toney Tiger (uncredited)
Danny Borzage
— Accordionist (uncredited)
Paul Bradley
— Ship Passenger (uncredited)
Thomas E. Breen
— Ship Steward (uncredited)
Virginia Brissac
— Miss Drake (uncredited)
Charles Coleman
— William (uncredited)
George Calliga
— Concert Spectator (uncredited)
Steve Carruthers
— Restaurant Patron (uncredited)
Wheaton Chambers
— Stage Manager (uncredited)
David Cota
— Bellboy (uncredited)
Sayre Dearing
— Ship Passenger (uncredited)
Dick Earle
— Concert Spectator (uncredited)