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Kim Kardashian: entrepreneur, fashion designer, reality show standout . . . extreme sports aficionado?

The E! star-turned-thrill-seeker, 31, showed off her rock climbing skills -- and those world famous curves -- on Twitter Tuesday when she posted sexy swimsuit shots from a recent photo shoot.

"Rock climbing, lol" and "Rock hard," Kardashian wrote in the tweets accompanying the racy images. (In one, she poses seductively in a skimpy, beige monokini; in another, she dons a green-striped henley tee, but not much else.)

Kardashian, who has been dating Kanye West since March, recently opened up to New York Magazine about their shared love of fashion -- and why she thinks it will help them go the distance.

"When this whole life is done, and it's just the two of us sitting somewhere when we're 80, you want to have things to talk about that you have in common," the reality star/designer explains. Before getting serious with her "Watch the Throne" rapper beau, 35, Kardashian admits "I think that's something maybe I didn't value as highly as a quality I cared about in someone."