| Katharine Hepburn | Sylvia Scarlett, aka Sylvester Scarlett |
| Cary Grant | Jimmy ``Monk'''Monkley |
| Brian Aherne | Michael Fane |
| Edmund Gwenn | Henry Scarlett |
| Natalie Paley | Lily Levetsky (uncredited) |
| Dennie Moore | Maudie Tilt (uncredited) |
| Lennox Pawle | Drunk (uncredited) |
| Daisy Belmore | Fat Woman on Beach (uncredited) |
Sylvia cuts her hair, dresses like a boy and flees French police with her father.
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