The Accidental Husband (2008)

Emma, a radio host, is about to be married to Richard, her perfect match. But right before her wedding, she learns she's already married to Patrick, a charming but irresponsible fireman. Furthermore, Patrick has a secret: he has arranged this little trick because Emma advised Patrick's ex-fiancée to end their relationship. However, Patrick may find that the trick is on him, for he soon begins to fall in love with his uptight adversary.