Nicolas has a happy existence, parents who love him, a great group of friends with whom he has great fun, and all he wants is that nothing changes. However, one day, he overhears a conversation that leads him to believe that his life might change forever, his mother is pregnant! He panics and envisions the worst.

Maxime Godart
as Nicolas

Valérie Lemercier
as Nicolas's mother

Kad Merad
as Nicolas's father

Sandrine Kiberlain
as Teacher

François-Xavier Demaison
as Mr. Dubon, aka 'le Bouillon'

Michel Duchaussoy
as Director

Daniel Prévost
as Mr. Moucheboume

Michel Galabru
as Minister

Anémone
as Miss Navarin

Louise Bourgoin
as Florist