I think Jennifer Aniston is a picture perfect image of health. She stayed hydrated during her trip to NYC with John Mayer Thursday. Since she's been spending time with Mayer, Jen seems to be happy as ever. The combination of love butterflies and Smartwater has Jen glowing. According to Aniston the simplest key to great skin is to drink lots of water. "I drink lots of water -water, water, water." she says.

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