Guillaume Canet is told by a young co-star that he's no longer Rock'n' Roll and can't sell films anymore. He then tries to prove her wrong and gets help from his girlfriend, Marion Cotillard.

Having every reason to be happy, forty-three-year-old father-of-one Guillaume Canet sees his world turn upside down when Camille, his young and fresh co-star, makes him feel like a sad has-been. Now, bent on proving her wrong, insecure Guillaume is eager to go to extreme lengths to change everything and regain his long-lost sex appeal, of course, behind the back of his significant other, Marion Cotillard. However, as the situation spins out of control, a drastic, uncontrollable transformation takes place, much to the horror of the cast and crew. But, above all, Guillaume wants to be cool again. How hard can it be?—Nick Riganas