04/11/2010 05:12 am ET Updated May 25, 2011

Jennifer Aniston Celebrates 41st Birthday In Cabo With Gerard Butler

Jennifer Aniston turns 41 on Thursday as she continues to fuel rumors she is dating Gerard Butler, her costar in 'The Bounty Hunter.'

Jen and Gerard grabbed some free press when they cuddled for the cameras at the Golden Globes and they just returned from Cabo San Lucas via private jet.

Jen celebrated her birthday in Cabo with Gerard and friends including Courteney Cox, Sheryl Crow and Jason Bateman. Jen stayed in $9,000-a-night, four-bedroom villa while she Gerard maintained separate sleeping quarters, the New York Post reports.

"Gerard had his own one-bedroom villa with a private pool, but he joined Jen for all the celebrations, and they looked extremely friendly but not overly flirty in public," a source told the paper.

Billy Bush was in Cabo to chronicle the festivities and a multi-part interview will air on 'Access Hollywood' starting Tuesday night. Jen did not take the opportunity to dismiss the possibility of a Gerard romance.

"We just had so much fun together you know. He's just fun. Gerry's the most unpretentious guy," she said. "He's a guys guy, but he's absolutely the most lovely and sort of self-deprecating and just what you see is what you get. We look at work the same way...we always had each other's back."

If you are tired of hearing about Jen and Gerard, you may soon find relief. 'The Bounty Hunter' opens March 19.

You can see pictures of Jen's bikini birthday vacation with Gerard here.