Cascart, Zazà's former lover and fellow actor, visits the popular actress in her dressing room. After being praised by the theatre manager Courtois and the regular theatergoer Milio, she goes onto the stage. Milio, seduced by Zazà in her dressing room, kisses her passionately. Zazà soon starts to live with Milio, but having heard from Cascart that Milio has a girlfriend in Paris, she goes there to find he has a family. When she sees Toto, Milio's infant daughter, she loses control of herself and breaks into tears and runs away. When she tells Milio that she has met his wife, he becomes infuriated. Having witnessed his fury, she turns him away and throws herself down in tears.
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