Lucie, who works as a white-hot fashion model, exhibits a dominant, often controlling, "Type A" personality, whereas identical twin Marie consistently projects a backward, reserved, laconic and unassuming attitude. When Lucie receives a covetable French recording contract, a significant problem stands in her way: the inability to sing. Marie possesses the voice of an angel, however, and quickly jets off to Paris to stand in for her sister, unannounced - little realizing the dangerous and even violent string of consequences that she is igniting.
| Directing | Gilles Paquet-Brenner | Director |
| Writing | Gilles Paquet-Brenner | Writer |
| Writing | Virginie Despentes | Novel |
| Production | Stéphane Marsil | Producer |
| Crew | Pascal Ridao | Cinematography |
| Sound | David Moreau | Music |
| Editing | Bertrand Collard | Editor |
| Sound | Marion Cotillard | Songs |
| Art | Françoise Dupertuis | Production Design |
| Costume & Make-Up | Corinne Le Flem | Costume Design |
| Costume & Make-Up | Valérie Protin | Hairstylist |
| Costume & Make-Up | Thomas Majorosi | Makeup Artist |
| Production | Gigi Akoka | Casting |
| Sound | Laurent Chassaigne | Sound |
| Sound | Antoine Deflandre | Sound |
| Sound | Lionel Montabord | Sound Editor |
| Sound | Jean-Alexandre Villemer | Sound Recordist |