Mitzi Gaynor as Jean Harris

George Gobel as George "Hotsy" Hamilton

David Niven as Patrick Harris

Reginald Gardiner as Gerald

Fred Clark as Horace Hamilton

Harry Bellaver as Marty Kennedy

Hans Conried as Jacques de Montaigne

Peggy Moffitt as Penny

Marilyn Hanold as Girl

Clinton Sundberg as Purser

Rex Evans as Burrows

Mary Treen as Mrs. Burnside

Charles Lane as Charlie Jenkins

Kevin Corcoran as Hans

Renate Hoy as Countess Von Lindorff

Margery Maude as Mrs. Hamilton