Justin Bieber and Hailey Baldwin brought their possible romance to Miami over the weekend. The could-be couple hung out on a yacht, did some Jet Skiing, and posed together in sexy Instagram snaps; Justin went shirtless [1] and wore his ever-present Calvin Klein underwear, while Hailey sported an Acacia bikini. Justin and Hailey have been spotted getting close during multiple outings this year, including Coachella [2]. Though the singer was rumored to have gotten back together with his ex Selena Gomez [3] and also recently linked to Shanina Shaik [4], it's hard to deny that he and Hailey have serious chemistry. Keep reading to see Justin and Hailey in Miami, and check out more of the sexiest shirtless moments [5] we've seen so far this year.