Jennifer Aniston and Owen Wilson get cozy in Miami

Owen Wilson has been cozying up to his Marley and Me co-star Jennifer Aniston whilst filming in Miami, sources claim.

The pair, who are currently playing a husband and wife on the set of the upcoming film, are getting close off-set, as well as during filming.

An on-set source said: "The hugging didn't end when the cameras stopped rolling

"They were very flirty together, far more than you would expect. In between takes they were hanging onto each other. They are very friendly."

Before they even started filming, the pair, both 39, had started to bond. It was reported late last year that the Hollywood stars were in regular contact with each other, speaking regularly by phone, with Jennifer - who split from Brad Pitt in 2005 - sending Owen some of her favorite books, including The Power of Now.

At the time a source close to the actress said, "Owen has come to rely on Jen's phone calls."

And now the pair are enjoying spending time together in Miami.

"Jen wasn't looking forward to it at first because she was worried about working with Owen, but he has turned out to be a real surprise," a source tells Star magazine. "She's finding out that he's a terrific guy who's fun to be around."

Marley & Me, based on John Grogan's memoir about his beloved Labrador retriever, is Owen's first major role since his failed suicide attempt last August.

And it looks like his chemistry with the former 'Friends' beauty was instantaneous. "Jen is known for being a recluse on set," says the friend. "But she's having so much fun hanging out with Owen. She's just really relaxed and happy, which is nice to see."