2007: The "Baby Bieber" Buzz Cut
Back when Justin was busking on the streets of Stratford, he kept his dirty blonde hair short and sweet.
2009: The Bieber
Baby, baby, baby oh!
When Justin first burst on to the music scene as a fresh-faced 15-year-old, his signature swoop became a huge part of his brand - with young fans swooning over every hair flip.
February 2011: Bald Bieber
Beliebers were traumatized at the sight of Justin's bare scalp despite it only being a part of a "Jimmy Kimmel Live!" skit.
February 2011: The Cut
Beliebers were left reeling when Justin revealed a brand new hairstyle on "The Ellen DeGeneres Show" while promoting his concert film/biopic "Never Say Never". The daytime talk-show host even auctioned off a lock of Bieber's hair, raising over $40,000 for an animal rights organization.
Around this time, the Biebs made his budding romance with Selena Gomez public while attending the Vanity Fair Oscar Party.
May 2011: The Spike
Justin upped his styling game with a swooshy spike at the Billboard Music Awards.
November 2011: The Classic Combover
While channelling vintage vibes at the American Music Awards, Justin somehow seemed younger in his attempt to pull off a more mature look.
January 2012: The Dye Job
Justin first dyed his locks a darker brown, showing them off during a red carpet event in Cannes.
April 2012: The Poof
The Biebs stopped by the Tribeca Film Festival with his hair reaching new heights. The pompadour proved to be a favourite of the pop star, with Justin circling back to the style throughout the year.
2013: The Shave
Justin first started sporting a side shave during his "Believe" world tour.
2014: The Mug
When Bieber was booked by the Miami-Dade Police Department for DUI and drag racing charges, his mug shot featured an unkempt mop in the midst of growing out.
May 2015: The Met
The Biebs returned to the spotlight in a big way. While attending the Met Gala, it seemed like Justin had cleaned up his act - and his hair. The then-21-year-old rocked a lighter, slick style on the red carpet.
August 2015: The 'Purpose' Punk
Prior to the release of his chart-topping LP 'Purpose', Justin debuted an edgy punk-rock-inspired look at the MTV Video Music Awards.
September 2015: Platinum Blonde
Just like his album, Justin went platinum while performing on the "Today" show.
January 2016: Purple Haze
Bieber showed off his brief love affair with lavender on Instagram in early 2016.
January 2016: The Cornrows
Is it too late now to say sorry?
Justin's controversial cornrows didn't last long but certainly caused quite the stir.
February 2016: Combine & Conquer
Justin walked the Grammys red carpet with his little brother Jaxon, as the pair both rocked stylish combinations of previous signature Bieber looks.
The move proved to be good luck, with Justin winning his first ever Grammy for Best Dance Recording.
April 2016: The Dreadlocks
Another hair-don't that spawned Bieber backlash.
Justin appeared at the iHeartRadio Awards rocking dreadlocks, which were promptly chopped off for causing a social media stir.
April 2016: Buzz 2.0
The Bieber Buzz proved to have real staying power, becoming a signature look for almost two full years.
March 2017: To Dye For
Case in point? The blonde buzz, which really worked for Justin.
2017: Back To The Beginning
As roots begin to appear, fans get their first hint that Bieber may be growing out his hair.
May 2018: The Return
Justin seems to be loving his long locks, revealing on his Instagram Stories that he wants to grow his hair "down to [his] toes."
June 2018: "Dirtcore" Chic
Justin's all smiles while embracing this greasy look with fellow pop star Post Malone.
August 2018: The Trim
Joined by fiancée Hailey Baldwin, Justin gets a trim in New York City.
September 2018: Bride & "Groom"
Justin and Hailey are spotted leaving a New York courthouse, and it would later be revealed they tied the knot in a private civic ceremony.
So that's what the haircut was for!
October 2018: The Man Bun
Justin sports one of Hailey's go-to styles - a messy bun - while exiting a coffee shop in Los Angeles.
October 2018: A Buzzed Bieber Once More
Guess who's back?
Bieber recently cleaned up his messy mop, bringing back his signature hairstyle.