1. Justin Bieber
Bieber gained all of his #Beliebers on YouTube. Bieber’s cover of Chris Brown’s “With You” went viral in 2007. Usher caught the vid and signed the kid up to his label. Since then Bieber is one of the biggest names in music with hits like “Beauty and a Beat” and “All That Matters.” Good looking out, Usher!
[Photo: Getty Images/Capitol Records]