It appears there is something going on between Jennifer Aniston and her co-star from The Break Up", actor Vince Vaughn. British paper Daily Mirror published a photo with Jennifer and Vince together, smoking, in a Chicago park during a break from shooting.

The Mirror quotes an onlooker who said: "They seemed very comfortable in each other's company and were quite spontaneous when they hugged."

During the last weeks, the two actors were pictured together cuddling on the set of "The Break Up" and at Vaughn's Four Seasons hotel in Chicago, where it is rumored Jennifer spent the night with the actor.

Both Aniston, 36 and Vince, 35, repeatedly denied any romantic implication, declaring they are only good friends.