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SmartWater does a body good!

The popular designer water brand captured Jennifer Aniston's fresh and natural beauty for their new ad campaign, and we cant take our eyes off the stunningly sexy b&w pics!

The Friends star stripped down to her undies for the day shot, and her signature LBD for a night on the town. But no matter what time it is, Aniston is always drinking her SmartWater!

Check out Jen's hilarious "sex tape" commercial for the brand, after the jump ...