These four future princes of R&B—still in their early teens—were made into a group by Vincent Herbert, the impresario who “discovered” Lady Gaga. They sing about missed curfews and innocent texts, but they already have a Top 10 record and know how to gyrate like Ushers-in-training. Dress code: Wifebeaters and black leather jackets, worn with dark sunglasses in da club. Dance party: Impressive bumping and grinding, popping and locking. Fan base: Shorties and ex-Beliebers who feel Biebs is over-the-hill.