Can you believe Justin Bieber is 25 years old?!

The singer celebrates his birthday on Friday, although it seems as if it was just yesterday that the pop star was sporting long, choppy hair and serenading fans on YouTube. When the Canadian singer was 12, his now-manager Scooter Braun discovered his YouTube videos and showed them to Usher, who became his mentor and helped him get a record deal.

In 2010, at age 16, Bieber's breakout hit "Baby" became the most-watched music video on YouTube, the platform where it all began. More than 2 billion people have watched it to this day. Since then, Bieber has released almost a dozen top 10 songs, including No. 1 hits "Boyfriend," "What Do You Mean" and "Sorry."

In 2014, Bieber underwent some legal turmoil—he was arrested on suspicion of DUI and drag racing and avoided a jail sentence. In a separate incident, he was charged with misdemeanor vandalism for pelting a neighbor's home with eggs. He got probation and paid the neighbors $80,000. Also that year, video footage of him urinating in a bucket while cursing out former President Bill Clinton went viral. Bieber later apologized.

Fans stuck by Bieber despite his troubles. In 2016, he embarked on his Purpose world tour and canceled it abruptly a year later. A source told E! News at the time that Bieber was "burnt out" from his constant touring.

Bieber's love life has also made headlines; His on-again, off-again relationship with Selena Gomez ended for good in early 2018. Months later, he stepped out with another former flameHailey Bieber, and shocked fans when it was revealed the two had gotten engaged amid their whirlwind romance. Fans were shocked even more when in September, the two went ahead and tied the knot in a courthouse ceremony. The two plan to have a larger wedding celebration in the future.

Check out photos of Bieber's evolution:

Justin Bieber, 2009

Bryan Bedder/Getty Images

ESC: Justin Bieber, Style Evolution

CARRIE SHALTZ/Patrick McMullan via Getty Images)

ESC: Justin Bieber, Style Evolution

Francois G. Durand/Getty Images

ESC: Justin Bieber, Style Evolution

Venturelli/WireImage

Justin Bieber, Hair, 2011

AP Photo/Joel Ryan

Justin Bieber, Hair, 2012

StarTraks

Justin Bieber

INFphoto.com

ESC: Justin Bieber, Style Evolution

Pascal Le Segretain/Getty Images

Justin Bieber, Hair, 2013

INF Photo

ESC: Justin Bieber, Style Evolution

Jon Kopaloff/FilmMagic

ESC: Justin Bieber, Style Evolution

Raymond Hall/GC Images

Justin Bieber, Cannes

Vittorio Zunino Celotto/Getty Image

Justin Bieber, 2015 American Music Awards

Jason Merritt/Getty Images

Justin Bieber, 2015 MTV Video Music Awards, VMA

Jason Merritt/Getty Images

Justin Bieber, Met Gala 2015

Larry Busacca/Getty Images

MTV EMA, Justin Bieber

Anthony Harvey/Getty Images for MTV

Justin Bieber, 2016 Grammy Awards

Jordan Strauss/Invision/AP

ESC: Justin Bieber, Style Evolution

Kevin Mazur/Getty Images for iHeartRadio / Turner

ESC: Justin Bieber, Style Evolution

Christopher Polk/Getty Images

ESC: Justin Bieber, Style Evolution

Kevin Mazur/WireImage

ESC: Justin Bieber, Style Evolution

Bauer-Griffin/GC Images

ESC: Justin Bieber, Style Evolution

Samir Hussein/Samir Hussein/Redferns

Justin Bieber

Elite Images/BACKGRID

ESC: Justin Bieber, Style Evolution

SMXRF/Star Max/GC Images

Justin Bieber

Justin Bieber, Spencer Pratt, Twitter

Twitter

Justin Bieber

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