The owner of Montmartre's most notorious nightspot, the Café Le Bal Du Paradis, Simone Pistache spends a great deal of her time in court, thanks to the banning of that "lewd and lascivious" dance, the Can-Can. So when her nightlife-loving lawyer and boyfriend, François Durnais, refuses to settle down and marry her, Simone decides to play up to his rival in romance, Parisian judge Philipe Forrestier, a lovestruck young jurist who's determined to make an honest woman out of her-- one way or the other.

Jack Martin is an American entertainer working cabarets on the French Riviera. An impersonation of philandering industrialist Henri Duran is 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. But matters threaten to get out of hand when Martin, dressed as Duran, is confronted by several of the philanderer's women, not to mention by Duran's ruthless business rival, M. Periton.