The Neighbour (2007) DVD

Successful, powerful and beautiful, dealmaker Christine Letellier has it all - including the one thing standing between her and a perfect place to live: hated neighbour Jeff Westley. Christine and her powerhouse fiance, Jonathan, have plans to expand her dream condo into a duplex large enough to house both of their egos - but thus fur, her effort, have been thwarted by the equally stubborn Jeff, who just happens to Lie renting the cherished unit just above hers.
As though they relish then conflict, Christine and Jeff's game of cat and mouse gets out of hand - then runs amok when Jeff receives an unexpected invitation to his ex-wife's wedding. Desperate to prove his worth to his former spouse, Jeff turns to Christine for a deal. They turn more than a couple of heads when she poses as his fiance -but despite her underhanded intentions, the wedding gives Christine a different viewpoint on the simple pleasures in life, and on Jeff.