Jennifer Aniston Strips Down for New Smart Water Ads

Jennifer Aniston, the 41-year-old star, shows off her perfect figure in a new Smart Water ad campaign.

In the black and white ad, the actress is pictured wearing her gym gear and clutching a bottle of the mineral water.

"My workout partner. Working out feels great...afterwards," the ad reads. "That's why I drink Smart. It's hydration I can feel. (And it's one part of my routine I never sweat.)"

Jen has been a spokeswoman for Smartwater since 2007. And, she looks so great and amazing in the new ad!