Jennifer Aniston Celebrates Her 41st Birthday with Gerard Butler

She's certainly a creature of habit – and why change a good thing?Jennifer Aniston headed to one of her favorite getaway spots, Los Cabos, Mexico, where the actress is getting a jump start celebrating her 41st birthday – Aniston's big day is actually Feb. 11 – with a group of friends. But this year, she had a surprise birthday guest: Gerard Butler, her costar in the upcoming comedy, The Bounty