Pierre Levasseur is a wealthy married Parisian executive involved in an affair with top model Elena Simonsen. When a paparazzo catches the two of them departing their secret hideaway and their photograph is published on the front page of the local newspaper, Pierre's wife Christine confronts him. He claims he has no idea who the woman is, and that she must have been a companion of the man seen walking beside them. Fully aware of the Pierre's difficult situation, Elena gives him an ultimatum: he must choose between her and his wife. Because Christine is the majority shareholder of his business, Pierre is in danger of losing his fortune if he divorces her. His lawyer Matre Foix advises him the only way to resolve the issue is to find the anonymous man in the photo and have him pose as Elena's lover. American release poster The anonymous man is hapless Franois Pignon, a parking valet who is in love with bookstore owner milie. Deep in debt and worried about her business, she has turned down his marriage proposal because she thinks of him as a brother. Matre Foix locates Franois and offers him money to let Elena move in with him and pretend they are a couple. Franois agrees and asks for the exact amount of money that will pay off milie's debts. Meanwhile, Elena demands 20 million to participate in the sham relationship, a sum she will return to Pierre when he leaves his wife. Dislodging his friend and roommate Richard, Elena moves in with Franois, who is overwhelmed by the situation, but the two quickly become friends. Christine is not fooled and plays the situation for all it is worth, making her husband jealous of Franois and Elena's living situation. milie, too, is confused and upset to see Franois and Elena together. Eventually, Elena explains the situation to milie, who is grateful for the funding Franois requested for her, and she acquires a newfound respect for him. Christine secretly tape records Pierre saying he has no intention of leaving her for Elena and offering to take his wife on a second honeymoon. When she sends the tape to Elena, she leaves Pierre and keeps the 20 million, and milie accepts Franois' proposal.