Hélène leads a sad life as editor of cheesy romance novels. But one day, when the old and delightfully eccentric American Mrs. Mills moves into the apartment next door, there is a sudden return to her everyday life. The two unequal women make friends in a hurry and Mrs. Mills is finally even the new face for Hélènes publishing - and that brings great success. But actually the old lady pursues a completely different plan. And is she even a lady?
| Actor | Role |
|---|---|
 Sophie MarceauHélène | Hélène |
 Pierre RichardMrs. Mills / Léonard | Mrs. Mills / Léonard |
 Nicolas VaudeEdouard | Edouard |
 Bastien UghettoCharles | Charles |
 Léna BrébanMathilde | Mathilde |
| GGaël ZaksStephen Boyd | Stephen Boyd |
 Stéphane BissotLa gardienne | La gardienne |
| DDaniel GoldenbergLe bibliothécaire | Le bibliothécaire |
| AAlessio CarboneLe danseur classique | Le danseur classique |
 Alexandre NguyenLe beau Chinois | Le beau Chinois |
 Lin DongfuMing Pei | Ming Pei |
 Marc LarnaudieClyde | Clyde |
 Stéphane BernSelf | Self |