Jennifer Aniston admits to being jealous of her ‘ Just Go With It ‘ co-star, Nicole Kidman , over one thing: Nicole’s eight -pack (yep, not just a six-pack ). “ 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.” LOL! Jennifer and Nicole even became workout buddies while shooting ‘Just Go With It.’ “We did yoga a couple of times out there in Maui. We did some planks together,” Aniston said. “Yoga is all core.” And what’s Jennifer’s secret for her own fabulous six-pack abs? “It’s just sit-ups!” Given Jennifer’s amazing body, I think whatever’s she’s doing is working just fine. Photos by FAME