Rihanna tweeted a picture of herself today in a very small bikini. The singer posted the picture of herself on a cross trainer while on vacation in Hawaii. The Daily Mail reports:

Most people dress down when they hit the gym, wearing loose tracksuit bottoms and T-shirt to be the most comfortable while exercising.

But Rihanna opted for something slightly more daring in Hawaii yesterday, sharing a picture of herself on her Twitter page wearing just a tiny white bikini as she posed on a cross trainer.

The 23-year-old singer teamed the triangle two-piece with a pair of huge sunglasses, and tweeted the shot with the caption: Haha, come tap this @Khloekardashian!!!’

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