As of March 1, Justin Bieber has just one more year to claim the "teen" in his pop star title. To celebrate the singer's 19th birthday, we look back at his rise to fame in 19 other photos -- plus an extra one for good luck.
In early 2009, a then 15-year-old Bieber had yet to become synonymous with the ubiquitous single, "Baby." At this point he was soaking up all he could learn from his mentor, Usher, whom he attended Nickelodeon's Kids' Choice Awards in March 2009.
The Stratford, Ontario native was discovered on YouTube before he was introduced to the world. Here, Bieber entertains crowds in his signature purple hoodie at Arthur Ashe Kids' Day, a U.S. Open event, in New York in August 2009.
By early 2010, Bieber had notched a chart-scaling album with "My World" and was ready to release "My World 2.0," which contained the single "Baby." Here, Bieber performs at the Pepsi Super Bowl Fan Jam in Miami Beach in February 2010.
Complete with a letterman jacket and a drum solo, Bieber surprises fans in an outdoor performance at the MTV Video Music Awards in Los Angeles in September 2010.
At just 16, Bieber was already an author. Here, he promotes his book, "First Step 2 Forever: My Story," at a New York bookstore in November 2010.
The pop idol attends the Los Angeles premiere of "Justin Bieber: Never Say Never," a 3-D documentary on his rise to stardom, in February 2011. He's accompanied by Usher and manager Scooter Braun.
That same month, Bieber shows off on the basketball court at the 2011 BBVA NBA All-Star Celebrity Game in Los Angeles. Even former NBA player
Scottie Pippen said he was surprised by Bieber's skills.
Madame Tussauds had everyone seeing double when Bieber's wax figure was unveiled in March 2011 in London.
Bieber attends the MTV Video Music Awards in August 2011 with a snake on one hand and then-girlfriend Selena Gomez h! olding on! to the other. He won the best male video award for "U Smile" that night.
Bieber was embroiled in
a baby mama scandal when he attended the 2011 American Music Awards with Selena Gomez, but you wouldn't know it by looking at the happy couple. A year later, Bieber and Gomez would no longer be an item.
The Biebs attends the NRJ Music Awards in January 2012, but he stays busy giving back when he's not hitting the red carpet. A month later
, he made a special Valentine's Day trip to a girl suffering from cancer. Photos he shared from their time together quickly went viral.
In June 2012, the singer was all smiles as he held baby brother Jaxon at the MuchMusic Video Awards in Toronto.
Biebs has a knack for concert mishaps. He managed to
run into a wall of glass backstage ! in June 2! 012, and in the fall of that year,
he got sick onstage before moving on with his performance in Glendale, Arizona. Here he performs at the Staples Center in Los Angeles in October 2012.
Bieber's relationship with Selena Gomez
seemed to end at the end of 2012, although their actions sparked rumors of reconciliation just about every other week. Regardless of their on-again, off-again status, Bieber chose to take his mom, Pattie Mallette, as his date to the 2012 American Music Awards.
Bieber had some of the "most influenti! al hair" of 2011 and also was ranked as one of the most charitable stars. Here, he showed off his style with Paris Jackson at the Michael Jackson hand and footprint ceremony at Grauman's Chinese Theatre in Los Angeles.
When you're Justin Bieber, you get a $100,000 electric sports car for your 18th birthday -- and from Ellen DeGeneres on her talk show, no less. 
Bieber makes his bread and butter as a teen pop phenom, but his social circle spreads far beyond. His appearance as part of boxer Floyd Mayweather Jr.'s entourage at a fight in May 2012 had everyone do a double take. Lil Wayne and 50 Cent were also on hand.
Bieber's immense fan base comes out! in full ! force when the singer releases his album "Believe." The disc not only went to No. 1, but it also had the year's biggest entry on the Billboard 200. How many can do that and graduate from high school (which he did in 2012) at the same time? 
The start of the new year hasn't been any better as a paparazzo dies in oncoming traffic after attempting to take a photo of the singer's car. A week later, photos hit the Web alleging marijuana use by Bieber. The singer kept his sense of humor through the ordeal, joking about it in his first stint as host of "Saturday Night Live." Here he performs in Washington in December.
