Alfredo is a crude Roman motorcycle repairman who is a friend of Count Max, a gentleman and ex-pleasure lover. The latter invites Alfredo to his residence in Campo dei Fiori and teaches him etiquette, French and how to play poker. The laughter will begin when Alfredo meets and chases the beautiful model Isabell Bellissima in Paris.
| Actor | Role |
|---|---|
 Christian De SicaAlfredo / Max | Alfredo / Max |
 Ornella MutiIsabella Matignon | Isabella Matignon |
 Galeazzo BentiConte Max | Conte Max |
 Anita EkbergMarika | Marika |
 Antonello FassariCesare | Cesare |
 María MercaderMadre di Pierre | Madre di Pierre |
 Maurizio FabbriFaciolo | Faciolo |
 Bruno CorazzariGeorge | George |
 Karen MooreAngelita | Angelita |
 Lucia StaraPatrizia | Patrizia |
| EEgon von FürstenbergSé Stesso | Sé Stesso |
 Jacques StanyPortiere Albergo | Portiere Albergo |
 John KarlsenMaggiordomo | Maggiordomo |
 Angelo BernabucciSignore Romano In Piazza | Signore Romano In Piazza |
 Bruno Del TurcoPeloso | Peloso |