Belles belles belles

Émilie, Sonia and Charlotte are three young women in the singing group "Les Filles", who are getting ready for the finale of a singing competition. Émilie is worried that her ex-boyfriend Sébastien will be there ("J'y pense et puis j'oublie"). The singers and dancers get ready for their performance ("Belles, belles, belles"). Sonia's controlling boyfriend, Grégory, laments that she is out of his reach ("Le mal aimé"). Émilie tries to console him ("Y'a le printemps qui chante"). Émilie and her brother Stéphane celebrate Les Filles' success so far ("Toi et le soleil"). Charlotte gets ready for an interview with a reporter, and her mother, who in the 1970s was a "Claudette", or one of Claude François' dancers, insists on being there. Charlotte's mother thinks back to her glory days ("Je vais à Rio"). The reporter arrives, and Charlotte's mother insists on answering all the questions, to make sure Charlotte does not undersell herself, until Charlotte yells at her to leave.

Charlotte meets Alexandre and immediately falls in love with him, which Sonia and the others make fun of ("Il fait beau, il fait bon"). The dance instructor, Vincent, arrives and tells Sonia that she has special talent ("Danse ta vie"). Mme Duval announces the opening of the Claude François Center, and Stéphane and his backup dancers perform an inaugural show ("Le Lundi au soleil"). Les Filles follow this up with their own song ("Magnolias for Ever").

Charlotte despairs that Alexandre has not answered his phone in two days ("J'attendrai"). Separately, Alexandre and Grégory lament their own troubles with women ("Chanson populaire"). Les Filles perform one of their songs for Mme Duval ("Comme d'habitude"). Sonia's father arrives, and Mme Duval and he reminisce about their own youths ("Cette année-là"). Sebastien arrives to ask Émilie to get back together with him, but she storms out. Sébastien calls Émilie at her house, and is surprised when Émilie's daughter picks up the phone ("Le Téléphone Pleure"). Grégory and Charlotte's mother declare their attraction to one another ("Je viens dîner ce soir"). Vincent scolds Les Filles for focusing on their relationship problems instead of rehearsing, saying that he, too, had once been heartbroken but life went on. Sonia asks him to elaborate, and he recounts to her a summer love that ended because of the girl's disapproving parents ("Pauvre petite fille riche").

Émilie reveals to her bandmates that she has a five-year-old daughter, and that Sébastien is the father but left her before finding out she was pregnant. She laments her situation ("Le chanteur malheureux"). Sébastien arrives to ask Émilie for another chance, and Émilie finally agrees ("Laisse une chance à notre amour"). Alexandre tells Charlotte that he is starting a band, and wants her to be the lead singer ("Une chanson française"). Émilie and Charlotte both independently announce that they are leaving the group, and Sonia realizes she will have to perform solo ("C'est pour vous que je chante (La claire fontaine)"). She leads the whole company in song ("C'est la même chanson"). The whole company returns for "Alexandrie Alexandra", then a reprise of "J'attendrai".