Brad is not happy with Jen!

Jennifer Aniston and her co star Gerard Butler are walking hands in hand like a loving couple. Aniston, 40 met Butler 39 on the set of their new movie "The Bounty" and both of them are enjoying and very happy with the romance. 'Jen and Gerard often practice kissing scenes even after the cameras stop rolling. Jen will say: "I think we need to do that again." Jennifer says Gerard's a great kisser. Gerard's been after Jen ever since they met at the Toronto International Film Festival in September 2008,' the source said. But Jennifer said no to him for almost a year. But now that they're in the same film, the romance has ignited.

But the surprising that came up is that Brad Pitt is allegedly not happy with the love story of his ex wife. But why Brad is behaving like a jealous and possessive husband when he has nothing to do with Jennifer? "Even though Brad's giving his relationship with Angelina another chance, he's clearly put out by Jen's romance with Gerard," says a source. Brad has such a hot a gorgeous wife at home still he wants Jen to be single. Have a look on the pictures of Jen and Butler; they really look so nice together.