Jennifer Aniston was behind the wheel of her Bentley yesterday in LA, not looking too thrilled with her traffic situation. She's been laying low since her recent 41st birthday, which Jen marked by hosting a dinner for friends after her bikini-filled vacation in Cabo. We, meanwhile, celebrated with a slideshow looking back at her exciting life. Now Jen's gearing up for a big promotional campaign ahead of her next film, The Bounty Hunter, coming out on March 19. She and Gerard Butler have been all over the place, including in the hot trailer.