Krysten Ritter
The Marvel's Jessica Jones actress jokes on Twitter, "It gets better kiddies!"
Amber Rose
The model calls herself an "ugly duckling" in this #TBT pic, but we think she was adorable!
Adam Levine
Who knew that this cute, young boy would one day become the Sexiest Man Alive?!
Prince
The legendary musician sported a sizeable afro in his school days.
Maggie Gyllenhaal
The Dark Knight actress sported a full mouth of metal back in the day.
JC Chasez
The former 'N Sync member had grown into a dapper, multi-talented performer.
Kelly Clarkson
Before she won American Idol, the "Stronger" singer was just a normal girl from Texas.
Jimmy Kimmel
The late-night host would probably crack a joke about this hairstyle from his yearbook pic.
Jay-Z
That shy, little kid from Brooklyn is now a confident, music mogul.
Jerry Seinfeld
The Curb Your Enthusiasm star rocked really long locks in high school.
John Legend
The "All of Me" singer transformed from a cute kid into a debonair Grammy-winning musician.
Mariah Carey
The "Fantasy" singer wasn't always the superstar diva that she is now.
Eminem
The Detroit rapper has toughened up his image since high school.
Joe Manganiello
The hunky True Blood actor has certainly come a long way since the days of mini-mullets and oversize glasses.
Kate Moss
The iconic supermodel is nearly unrecognizable now since ditching her frizzy auburn hair and feathery bangs.
George Clooney
Whoa! Even one of the sexiest men alive had a mullet in high school.
Judy Greer
The 27 Dresses actress has transformed herself into a movie star since she rocked large, round glasses and a super-short chop.
Amy Poehler
The Parks and Recreation funnylady rocked some majorly voluminous hair in this vintage yearbook photo.
Jon Stewart
The comedian almost looks exactly the same in his old yearbook pic—minus the long haircut.
John Mayer
The "Your Body is a Wonderland" crooner has grown into a sexy, ladies man since this innocent yearbook photo was taken.
Kirstie Alley
The Cheers actress sported an unflattering super-short hairstyle in her younger days.
Henry Cavill
The sexy Man of Steel star has definitely gotten back at the haters who used to call him "Fat Cavill" as a child.
Gwyneth Paltrow
Although she looks adorable, the Iron Man star probably doesn't miss the days of blunt bobs, blue eyeshadow and old lady dresses.
Jake Gyllenhaal
Back in the day, the Prisoners hottie was still adorable in his thick, black glasses.