Selena Gomez [1] slipped into a sexy two-piece during a beach day in Mexico. The singer looked downright giddy as she hit the water with a group of friends on Tuesday. While it's unclear if her boyfriend, DJ Zedd [2], was on the trip with her, Selena didn't seem to have a care in the world while splashing around with an inner tube and doing some boogie boarding in the waves. Selena has been keeping a low profile since the Comedy Central roast of her ex-boyfriend Justin Bieber late last month. She was the subject of a few jokes [3] during the event, but her busy work schedule [4] may have helped her brush them off. Keep reading to see more photos of Selena in a bikini, and check out more stars who have already been hitting the beach this year [5]!