The Holy Child (2001)

Original title: Le divin enfant

Marc (Lambert Wilson) is a man of the cloth who's gained a bit of celebrity for his public espousal of religious celibacy. In fact, he's even written a book about the subject. But Marc's 15 minutes of fame could be up when a bratty teenager turns up claiming to be the priest's son. Together, they forge a pact that will keep the "secret" under wraps … but all bets are off when the celibate priest finds himself falling for the boy's mother.