Justin Bieber Sees London, Fans See His Underwear (PHOTOS)

Justin Bieber put on a show at the O2 Arena on Monday night, and then a smaller, more private one for onlookers waiting outside of his London hotel afterwards, when the teen pop sensation flashed a bit of his boxers for the world to see as he dashed from his car.

Bieber, who’s in the middle of a tour of the U.K., arrived back at his hotel late Monday in a green YMCMB hoodie (Young Money Cash Money Billionaires) with matching green pants. Then, there was a big, black void between JB’s top and bottom, and it turned out to be his underwear due to some saggy sweatpants. Fans who got a glimpse of it were all smiles — as was Justin.

Justin’s O2 concert on Monday was the first of three in London before he heads to Manchester. He previously performed in Liverpool, and also gave Ireland a dose of Bieber Fever with two concerts in Dublin. Bieber said via Twitter following Monday’s show: “AMAZING SHOW 2nite at the O2!! Brought out Craig David which was crazy because I grew up listening to him. #myworldtour”