Los Angeles:

Jennifer Aniston, the estranged wife of Brad Pitt, and her co-star Vince Vaughn have sparked rumours that they are a couple when they got cosy at a party for the movie ‘The Break Up.’

Onlookers say they got “very cosy with each other. Very friendly and very comfortable with each other. The hand on the leg, the arm on the shoulder.” The pair left the party and headed off to a Dwight Yoakom concert. A source said: “They had their arms around each other. Then they were dancing. Then they were straight making out.” But an agent for Aniston says: “Do not read into this. At the wrap party... everyone was enjoying themselves, cast and crew included, and they were all being very affectionate to each other.”