Justin Bieber
Justin Bieber's career is a testament to the power of the Internet and Bieber fever. The pop star, who taught himself to play piano, trumpet and guitar, was raised by single mom who chauffeured him to talent shows and uploaded performance videos on YouTube. It was these covers of Chris Brown, Michael Jackson and Ne-Yo (plus his swoopy hairstyle, adorable baby face and made-for-the-stage presence) that quickly turned him into a viral sensation and caught the attention of manager Scooter Braun and Usher, who signed Bieber to Island Def Jam. His first album, 2009's My World, debuted at No. 6
