Rihanna Continues Bikini Tour In Hawaii (PHOTOS) By Jackie Willis Celebuzz Rihanna never ceases to shock with her array of scantily clad ensembles. The most recent is this black thong bikini she chose to wear on Thursday during her Hawaiian vacation. The 23-year-old "S&M" star was spotted wearing the bum-baring swimsuit while she played around in the waves on a surfboard. Though some may say this suit is a tad inappropriate, you can't deny that her physique is pretty flawless! Click the pics to see her other bikini moments! This suit can't be too surprising after those topless photos of her surfaced this past year when she was filming her music video for "We Found Love" in Ireland. Rihanna commented on her super sexy and shocking style to Glamour magazine in the September 2011 issue, saying: "Getting dressed, I want to pick the most bizarre pair of shorts so I can figure out how to make it look right, or work an outfit that will make people go, "What the hell is she wearing?"" She's not the only one who likes to make a statement with her swimsuits! Click the pics below to see some of the sexiest celebrity bikini Twitter pics. Be sure to follow Celebuzz on Twitter, Facebook and Tumblr for more Rihanna coverage.