Topless Rihanna Frolics Underneath Hawaiian Waterfall

Is Rihanna auditioning for Girls Gone Wild?

The "Where Have You Been" singer, 24, shared a handful of racy pictures from her Hawaiian vacation via Facebook Monday. In one image, the naughty star flings off her white bikini top while standing underneath a waterfall. She does, however, remember to cover her breasts with her right hand.

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Other sexy images include the singer playing with the strings of her bikini bottoms on the beach, descending into a shark tank and posing in front of the pool.

Rihanna
Credit: Facebook

In March, the VitaCoco spokeswoman told Us Weekly how she maintains her amazing bikini body. "I don't really have a workout routine. I'm very inconsistent when it comes to actually working out, but I find other things to do that are active, like dancing," she said. "I love swimming -- anything in the ocean. That's very, very good for your body."

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The Battleship actress, who occasionally goes hiking or horseback riding in L.A., added that her recent weight loss wasn't intentional. "That was not something I even tried to do," Rihanna told Us. "I never weighed myself, so I don't know how much weight I was to know how much I lost. . . but I dropped two sizes down."

Rihanna
Credit: Facebook

She added: "I'm not excited about how skinny I am, so it wasn't a goal for me or anything."

The singer said she's also "in the early stages" of working on her next album, "but I won't be putting that out anytime soon. I want Talk That Talk to have its full life."