Justin, turn around!

Pop singer Justin Bieber posted a photo to Instagram of him standing on the stern of a yacht and pointing at the landscape beyond. It would have been a normal vacation photo of the star if he wasn't completely naked. "Look!" the caption below the photo urges. Within the first ten hours, the photo of Bieber's buttocks garnered 1.5 million likes, and a campaign has begun on social media under the hashtag #turnaroundjustin (turn around, Justin!). Justin Bieber is vacationing on a rented yacht in the South Pacific. He is now rumored to be off the coast of Bora Bora . Earlier on Monday, the singer posted a photo of a reef shark bitten friend he's traveling with. Bieber isn't the first star to show his heel on a yacht. Elton John, for example, once had fun in such a way.