 Hélène and Ermerance overhear a conversation where Florestan breaks off his liaison with Agathe, in the process learning that he is Hélène's intended husband.When Florestan complains that he must leave Agathe for a simple girl from the provinces, Hélène vows to take revenge on him, although she finds him handsome.To celebrate the last day of his bachelorhood, Florestan invites the entire staff of Coquenard’s shop for a party in Romainville.