Justin Bieber turns the big 2-1 on Sunday, March 1!
While the singer has undoubtedly experienced his fair share of highs and lows on his journey to fame, ET has been with the singer through it all.

To celebrate his big day, we've delved deep into our vault to find our favorite moments with the Biebs that turned us into Beliebers... starting with our very first interview with the "Baby" singer at the 2009 Kids' Choice Awards when a then 15-year-old Bieber was on the brink of global stardom.
"I just put up my [YouTube] videos for my friends and family and it turned out other people liked them," a barely known Justin explained while being escorted down the carpet by Usher.
Fast forward one year, at the 2010 Kids' Choice Awards, and Bieber Fever was in full effect and Justin was soaking up every bit of female attention.
"There's a lot of girls... it's great, I love girls. Girls are awesome!"