It's no secret that yoga devotee Jennifer Aniston works hard when it comes to keeping fit.
But the extent to which her body has become honed had been kept under wraps – until now.
Gorgeous Jen, 41, shows off her incredible figure in a new advertising campaign for a brand of mineral water.
With her athletic stomach bared, the actress is photographed in her gym gear clutching a bottle of Smart Water, with the caption: "My workout partner. Working out feels great…afterwards.
"That's why I drink Smart, It's hydration I can feel. (And the one part of my routine I never sweat.)"
Known for her love of exercise – she is often seen out running – the Bounty Hunter beauty recently spoke out about her fantastic figure after reports surfaced she had embarked on a baby food diet, which entails eating 14 servings of pureed food a day followed by a healthy dinner.
Speaking to a US publication, Jennifer – currently filming Just Go With It with Adam Sandler and Nicole Kidman in Hawaii – said: "I've been asked this lately, 'Jen, what's this baby food diet all about?' I kept thinking: That's the strangest question ever."
"Sorry, but the last time I had baby food, I believe I was one," said the actress. "I've been on solids for about 40 years now."
Jennifer isn't the only famous face who has unveiled their impressive physique for Smartwater.
Earlier this month, a new advertising campaign starring new dad Tom Brady – sports star husband of model Gisele Bundchen – was revealed.
One of two photos, it showed the muscular American football star 'climbing the corporate ladder' with the words: "Electrolytes: remember, you don't work for them. They work for you."