Justin Bieber gave fans a treat when he posted a photo of himself wearing nothing but Calvin Klein underwear on his Instagram. The singer took a "glacier dip" in Iceland and is seen giving a high five in the photo soaking wet and rocking his tighty whities. It seems as if Calvin Klein has been somewhat of a Justin Bieber sponsor lately, JB posted another photo on his IG of himself behind the scenes of his new music video What Do You Mean shirtless showing off his CK briefs.