After closing his agency Alibi.com and promising Flo (Élodie Fontan) that he will never lie again, Gregor (Philippe Lacheau) starts a new life - sweet, romantic, but a bit boring. But not for long! When Gregor proposes marriage, Flo and her family (Nathalie Baye and Didier Bourdon) want to meet his parents. But how can he introduce them to his divorce-ridden criminal father (played by Gérard Jugnot) and his erotic film star mother (played by Arielle Dombasle) Greg's Alibi.com friends Medhi and Augustin (played by Tarek Boudali and Julien Arruti) intervene and find him fake parents to save the day... Until the real parents show up! Greg panics. He uses his neighbour's house to introduce his parents to a fake bride, just to keep them out of the real wedding. Soon, he has two marriage ceremonies to attend, and the web of lies is so dense that the situation is getting out of hand. Little does he know how devastating it really is when an unexpected guest crashes a wedding party - but is it a real one or not?