On the Riviera

Jack Martin, an American entertainer working cabarets on the French Riviera, does an impersonation of philandering industrialist Henri Duran so convincingly that even Duran's beautiful wife is fooled by it. When Duran's business interests compel him to be in London when he should be hosting a large soiree at his home, Martin is persuaded to impersonate Duran at the party... (imdb)