Rihanna flaunts her sexiness whever she can so it's no surprise that she'd workout in a bathing suit.
The Barbados pop sensation tweeted a photo of herself in a bikini and sunglasses on an elliptical and added "Haaaa!!! Come tap this @KhloeKardashian."
She's young and just wants to have fun and we can't blame her. But what was the Khole Kardashian @ about? Is there a girl crush afoot? Anyway, it's good to see Rih taking a break and having fun while she can.