Happy Birthday Bieber! Justin's 18 Most Essential Moments
Justin Bieber Talks Next Single, Kanye West Collaboration

Thursday, March 1 marks a special day for a special young man -- Justin Bieber, the teen superstar currently running the pop universe, has turned 18 years old. While Bieber has only been in the public eye for roughly three years, the singer has mounted a staggering list of accomplishments in that period, from three No. 1 albums to a Grammys performance to his own singing dolls, and everything in between.

To celebrate Justin Bieber becoming an adult and blowing out 18 candles, check out Billboard.com's rundown of the singer's 18 most memorable moments so far, and tell us what you think about our choices in the comments section.

Young Justin Stops By the Billboard Office (August 27, 2009)

Back when he was just a 15-year-old rising star, Bieber stopped by the Billboard offices to perform an acoustic version of "One Time" and talk about how he was just a "regular kid." "I started YouTube after I was in a singing competition," Bieber explained at the time. "It turned out that people started liking it…so I just kept posting more videos."

The Biebs: Welcome To 'My World' (Nov. 17, 2009)

YouTube star Justin Bieber was officially introduced to the world with his "My World" EP, which featured singles like "One Girl" and "One Less Lonely Girl" and an appearance by his pop mentor, Usher, on the track "First Dance." The album was filled with inspiring takes on young love, and tween girls were quickly at the Biebs' mercy.

A Star is Born: "Baby" Video Released (Feb. 19, 2010)

Sure, Bieber had had his share of breakout singles before "Baby" was released -- who doesn't remember "One Time" or "One Less Lonely Girl"? But the video for "Baby," set in a bowling alley and featuring Ludacris, was a game-changer for the young Canadian star, and helped him reach a new level of ubiquity. 711 million YouTube views later, we're still singing "Baby, baby, baby, OOOOH."

Justin Bieber Scores His First No. 1 Album (March 31, 2010)

Bieber fever officially arrives when "My World 2.0," featuring singles like "Baby," "Somebody To Love" and "Eenie Meenie," notches Bieber his first No. 1 album on the Billboard 200, selling 283,000 copies in its first week, according to Nielsen SoundScan. In the two years since then, Bieber has scored two more No. 1 full-lengths: his "Never Say Never" remix album and his "Under The Mistletoe" holiday set.

Take Justin Home! Bieber Dolls Hit Stores (Dec. 4, 2010)

Since it's so hard to get the real Justin Bieber to come home and hang out with you, merchandise company Bravado and The Bridge Direct, Inc. offered the next best thing: singing dolls sporting the adorable likeness of the teen superstar. After the first wave of Bieber dolls flew off the shelves before the 2010 holidays, a new, "real hairstyle" collection went on sale the following summer.

Justin and Selena Hold Hands, Millions of Teenage Hearts Break (Feb. 6, 2011)

The Green Bay Packers were the big winners on Super Bowl Sunday in 2011, and the big losers were every girl pining after Justin Bieber, who was shown holding hands in public for the first time with his long-rumored girlfriend, pop star Selena Gomez, in Santa Monica. The two have been a confirmed item ever since, free to run amok and crash weddings between music video shoots.

Bieber Immortalized by 'BasedGod' Lil B (February 8, 2011)

Cult rapper Lil B is known for his hip-hop odes to random celebrities (see: his tracks "Miley Cyrus" and "Bill Bellamy), but there was something special about his track "Justin Bieber," which features the chorus "Bieber, bieber, bieber, bieber… Justin, justin, justin, justin." Although Lil B claims that "Everybody know that Justin Bieber is my cousin," the jury is still out on that one.

Big Screen Star: 'Never Say Never' Hits Theaters (Feb. 11, 2011)

"Never Say Never," a 3D feature film that chronicles Justin's beginnings and features a whole mess of concert footage, arrives at local multiplexes in February 2011. The flick took in $30.3 million in its opening weekend, good enough for a No. 2 debut.

Justin and Usher Team Up For Grammys Performance (Feb. 13, 2011)

Bieber may have lost the Best New Artist Grammy to Esperanza Spalding in 2011, but the singer delivered one of the ceremony's most memorable performances when he performed alongside his mentor, Usher. After playing an acoustic take of "Baby," Bieber developed a taste for dance-fighting, and took on some ninjas during a rendition of "Never Say Never."

Next: Bieber on "CSI" and "SNL," And That Infamous Haircut