Bad movie with exaggerated and infantile characters

This is a bad movie with exaggerated and infantile characters, flat and forced humor. Often you wonder why the characters behave such childish and the only reason is that otherwise the whole movie would collapse (wouldn't be funny and the plot would get stuck).

The only highlight was Virginie Ledoyen, but her character Audrey Morraine was not less infantile, e.g. when she broke up via cellphone after seeing Mathias for some seconds with his ex-wife.