What you'll need:
Justin Bieber has billions of YouTube views, sold-out concerts and even a memoir coming out. He's also 16. This Halloween, why not dress up as the kid who's dominating pop culture? All you need is a hoodie and sneakers, a pillow-lipped pout and, of course, the trademark forward-swept hairdo. Warning: If your Bieber costume is too good, neighborhood tweens will start chasing you down the block.