Unless you've been living under a rock (or somewhere with really crappy Wi-Fi) you can't have missed everyone sharing their #tenyearchallenge all over social media. The premise? Scroll back an entire decade on Facebook - through the dodgy fringes and questionable eyeliner - and post possibly the worst photo of yourself from 2009 alongside a relatively-decent present day pic.
So, now we've seen all our mates' glow ups, we thought we'd look back through someof our fave celeb throwbacks. We're talking a time when Justin Bieber's fringe had patent pending, Holly Willoughby served some surprisingly-emo vibes and Cheryl was on her second surname.
Check out the BEST celeb throwbacks from 2009
10 Year Challenge: The BEST celeb throwback pics from 2009
1 of 15Victoria Beckham
Posh Spice said Goodbye (pun very much intended) to her famous 'Pob' hairstyle in 2009 and went for a more drastic black pixie crop.
2 of 15Holly Willoughby
Pregnant Holly was rockin' some emo black eyeliner at the 2009 BRITs.
3 of 15Kylie Jenner
12-year-old Kylie was a fan of the full fringe back then. SAME, babes.
4 of 15Caroline Flack
So indie, hun.
5 of 15Ariana Grande
16-year-old Ari didn't discover ponytails for a few more years.
6 of 15Simon Cowell
Pretty much the same, tbh.
7 of 15Kim Kardashian
Who knew Kim K was into rock back in 2009? Move over, Gene Simmons.
8 of 15Cheryl
Ah, 2009. When tiaras were the ultimate accessory.
9 of 15Ant McPartlin and Dec Donnelly
Okay, so now we feel old.
10 of 15Kendall Jenner
Can we discuss how fresh-faced 14-year-old Kendall Jenner looks?
11 of 15Caitlyn Jenner
Caitlyn owned her transition in an inspirational post about the #10yearchallenge, saying: "Now THAT is a #10YearChallenge Be authentic to yourself ud83dudc9c."
12 of 15Justin Bieber
Two words: THAT FRINGE.
13 of 15Phillip Schofield
Is Phillip Benjamin Button or something? The chap's ageing in REVERSE.
14 of 15Selena Gomez
Adorable.
15 of 15Taylor Swift
Taylor in 2009, way before she met a certain One Direction member or Kanye West.