Guess Who?

Guess who returned to his hotel shirtless with a pair of low-slung trousers that barely cover his derrière?

Justin Bieber was spotted arriving back at his London hotel shirtless after performing a concert in Birmingham. No one knows why the soon-to-be 19-year-old singer had his shirt off and trousers down in the freezing winter weather currently gripping London.

Maybe he is trying to show off his 'bulkier' upper body or something....

I cannot for the life of me figure out why anyone would want to walk around town with their trousers hanging down and derrière exposed.