She's a girl from Paris (1957)

Lyane is a singer and daughter of the producer of the operetta: "C'est une fille de Paris". She convinces the composer of the music, Jacques Kellermann, whom she loves, to sign her piece. The famous composer Jean Paget, who cannot put the work to his advantage, declares to Jacques that Lyane had a child by him. Shocked, Jacques breaks with the singer who soon knows the celebrity. Finally, he realizes that happiness is ready to be seized, because the beauty still loves him...