He's not a boy, not yet a man, but as of March 1, Canada's hottest teen export is officially a legal adult.

Love him or hate him, there's no denying the impact singing sensation Justin Bieber has had on pop culture since he first YouTubed his way onto the music scene three short years ago. From his rise to fame as an online phenomenon to the worldwide madness known as "Bieber Fever" (and every makeout session in between), it's been the ride of all rides for the Stratford, Ontario native (and his hair of course.) In honour of JB's milestone birthday, we take a look back at some of the most memorable and controversial moments in his young life.

See also:

• Top 20 celebrity power couples: What's Justin Bieber and Selena Gomez's ranking?
• Justin Bieber makes cancer-stricken girl's wish come true
• Top 10 nuttiest celebrity fans of all time: would you tattoo Bieber's face on your thigh?

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