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"We are envious of each other's bodies," the Decker actress tells Us Weekly. "We decided that I'm going to borrow her butt for a day -- and she's going to borrow my breasts."
The two beauties are surely not alone in their desire to borrow each other's bodies. Rihanna, 24, is quite free about showing off her body in revealing short outfits, plunging necklines and barely there bikinis.
But despite her popularity as a former Sports Illustrated swimsuit cover model and her much-hyped bikini scene in the Adam Sandler comedy Just Go With It, 25-year-old Decker -- who is married to tennis champion Andy Roddick -- is actually much more modest in real life than her films.
"Because I'm such a tomboy, I hate showing off my body," she told FabSugar at a New York City event last month. "[My stylist] is always like 'you have to show your figure.'"
Decker prefers dressing like a "tomboy" in jeans and tees -- and even when she's walking the red carpet, her favorite gowns have a more "athletic" cut.
"We have to kind of balance each other out," said of finding styles that skim her curves but aren't too risque.