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Jennifer Aniston's got some ab envy!
While shooting the rom-com "Just Go With It" with Nicole Kidman in Hawaii, the 42-year-old actress said it was hard to believe how "rock-solid" the mom of four's midsection was.
VIDEO: Jennifer gets "curious" about becoming a nudist
"I walked up to her and I said, 'I'm sorry, can I touch them? I have to touch them,'" Aniston revealed on Ryan Seacrest's KIIS-FM radio show Friday. "'Is that spray-painted? What is that?' I think it's an eight-pack."
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The single star — who's been known to flaunt her own toned tummy in skimpy two-pieces over the years — said she and Kidman, 43, even became workout buddies off set.
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"We did yoga a couple of times out there in Maui. We did some planks together," Aniston said. "Yoga is all core."
As for how she maintains her own six-pack? "It's just sit-ups!"
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