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Jen Aniston Flaunts Beach Bod in Tiny, Hot-Pink Bikini

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She wore an itsy-bitsy hot-pink bikini…

Last week, Jennifer Aniston shot another scene for Just Go with It on the Hawaiian island of Kauai — wearing close to nothing.

Related: PHOTOS: Jen's hottest bikini shots

Shooting near a tropical waterfall, the 41-year-old actress wore a barely-there, hot-pink bikini. The tan star's super-sleek physique is no accident. "She's obsessed with staying fit and young," a source tells Us Weekly.

Adds a source, "She very rarely misses a workout, even when she's traveling." Indeed, between filming scenes her latest flick, the 5-foot-6 actress hit the treadmill or StairMaster for an hour daily, sipped pureed papaya, pineapple and mango and dined on veggies and fish.

Related: PHOTOS: Stars' bikini body secrets

And Aniston has another incentive to look good on the Just Go With It set: 23-year-old costar and Sports Illustrated cover girl Brooklyn Decker. "Jen's intimidated," the source says of Decker. "She's very conscious of her body."

Related: PHOTOS: Look back on Jen's years with Brad Pitt

Back home, the fitness fiend has added Tracy Anderson's dance cardio to her routine as well.

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