Pull your pants up, Bieber! Justin's low-slung look voted worst fashion faux pas  of the century

A new poll ranked the worst FASHION TRENDS of the 21st century . . . even though we're only 12 years into it.  Sagging pants and exposed underwear on men came in first.  Jeggings, fake designer purses, and socks with sandals made the list too.

arriving back at his London Hotel shirtless after performing at a Birmingham gig.

arriving back at his London Hotel shirtless after performing at a Birmingham gig.