Justin Bieber Birthday: Singer Turns 18 (PHOTOS)

Happy birthday, Justin Bieber!

The teenage superstar celebrates a milestone birthday March 1 when he turns 18 years old -- making him legally allowed to do such things as vote and get a tattoo, though that hasn't stopped him from getting some ink before.

Let's take a look back at 2011, which was a was a whirlwind year for the pop star, both professionally and personally.

The biopic about his rise to fame, "Never Say Never" was released in February 2011 and was a box office boom, and his "My World" tour had fans screaming around the world to get a glimpse of their idol up on the big stage. While Bieber is preparing for a new album to drop this spring, he didn't leave his fans empty-handed this Christmas, and released a holiday album, "Under the Mistletoe," as a special treat.

Bieber certainly grew up over the past year. He and girlfriend Selena Gomez made their red carpet debut at Vanity Fair's 2011 post-Oscars bash, and the two piled on the PDA while on vacation together in Hawaii and have been spotted on dates all over the world together.

While things seem to be going well on the relationship front, Bieber got his first taste of some adult drama last fall, when Mariah Yeater claimed that the teen singer had sex with her backstage at one of his concerts and was the father of her baby. DNA tests were submitted, and the matter quietly went away after some serious legal threats from Bieber's camp.

Bieber has clearly done quite a bit in his short 18 years. We wonder what the coming year will bring.

Check out some flashback photos of Justin Bieber below:

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