Shortly after two of the most famous Hollywood singles - Jennifer Aniston and Owen Wilson – started filming the movie “Marley and Me” in Miami, rumors started to spread about a possible romance between them.

According to Star Magazine, the co-stars have been spotted having fun together in Miami and seeming very close to each other.

Jennifer and Owen are playing husband and wife in the film directed by David Frankel. The film, also featuring Alan Arkin, is based on the memoir by John Grogan and tells the story of a family who learns life lessons from their adorable and naughty dog.

The romance between the two actors in the movie seems to continue off screen, as a crew member tells Star Magazine.

"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," he said.

A friend of Aniston also confirmed the rumor. She said that Aniston had been worried about working with Owen, but she was surprised to discover he actually was a nice guy, who she loved to hang around with.

"She wasn't looking forward to the film at first because she was worried about working with Owen, but he has turned out to be a real surprise. She's finding out that he's a terrific guy who's fun to be around," her friend told Star.

"Jennifer is known for being a recluse on set. But she's having so much fun hanging out with Owen. She's just really relaxed and happy, which is nice to see," she added.

This is the first time Owen, 39, returns to a film set since his reported suicide attempt last summer. The filming started on March 10 and will continue until mid-May, Twentieth Century Fox said.

John Grogan expressed his content with the casting. “I'm actually really thrilled to have Owen Wilson portray me. We don't look anything alike but I think his personality will be a great fit to my own,” he told the magazine People. “And my wife, Jenny, is thrilled with being played by Jennifer Anniston and so am I. What's not to like, right?”