Justin Bieber

Tender-aged YouTube pop sensation Justin Bieber is an inspiration to 15-year-olds the world over as his first single, "One Time," has gotten his face all over MTV and his music on the airwaves of the U.S. and his native country of Canada. Bieber instigated a bidding war between Justin Timberlake and Usher when YouTube clips of him performing Ne-Yo, Stevie Wonder, Timberlake and Usher covers made the rounds in 2006; Bieber was just 12. He eventually signed with Usher's label, Island Records, and moved from Ontario to Atlanta, Ga., where Usher acts as a consultant on the teenager's music. His debut album, My World, is slated for release in November 2009.