It's hard to believe that Justin Bieber, once known for being a precocious teen, turns 22 years old today. In many ways, the world watched him grow up -- for better or for worse. He hit a speed bump or two along the way, but today he's matured and is now officially a Grammy award winner.
Justin was discovered in 2008 through his YouTube videos. Here he is singing Chris Brown's "With You."
Read More: Watch: Listen to Justin Bieber's New Song "What Do You Mean"