Amy Schumer
Bewitching! The Comedy Central star jokes that she was "dressing as myself for #tbt."
Taylor Swift
"When you dress as the yellow teletubby for Halloween, but it's before Teletubbies got huge so all the kids at school ask you why you're dressed as a yellow pregnant alien," Swift wrote in an Instagram caption.
Cara Delevingne
Not sure if the gorgeous supermodel would ever sport this eccentric look on the runway now!
Ed Sheeran
There's a reason people are afraid of clowns, and the "Thinking Out Loud" singer's baby pic might just be why.
Emma Roberts
Even before her American Horror Story and Scream Queens days, the actress clearly had a fling for the spooky.
Miley Cyrus, Billy Ray Cyrus & Braison Cyrus
The wild child singer makes a picture perfect princess alongside her little bro and daddy.
Lena Dunham
Judging by the plethora of wild ensembles, the Girls star probably won quite a few costume contests in her day.
Ariana Grande & Frankie Grande
This brother sister duo always went all out for the holiday.
Kyle Richards
The Real Housewives of Beverly Hills star channels her inner pirate alongside her now 15-year-old daughter, Sophia.
Victoria Justice
This brunette cutie made the most adorable 80s rocker back in the day.
Adam Shankman
The famed director and choreographer strikes a seductive pose before hitting the stage.
Sarah Hyland
The Modern Family actress seemed to be missing her Thing 2 on Halloween a few years ago.
Rowan Blanchard
What would this Girl Meets World star's childhood memories be without a visit to the pumpkin patch?
Jessica Alba & Rachel Zoe
This witchy duo wasn't really scary, but they certainly were fashionable.
Christian Siriano, Pink & Brad Walsh
Check out the dashing divas!
Khloé Kardashian, Kris Jenner & Kourtney Kardashian
This fam was always good at playing dress up!
John Stamos
The ageless hottie admitted he wasn't sure what this early '80s costume was supposed to be, guessing, "a slutty??"
Kate Middleton
Once upon a time, this princess was a witch.
Lindsay Lohan
Before she was a teen queen, she was a Disney Princess!
Martha Stewart
Naturally, the domestic goddess was once the world's most perfect Little Bo Peep!
Caroline Manzo
Big hair, don't care? Speculate as you will what this Real Housewives of New York star was supposed to be.
Cindy Crawford & Rande Gerber
Sandy and Danny Zuko, watch out for these two!
Nicole Scherzinger
At seven years old, this future Pussycat Doll dressed up as Carmen Miranda.
Emma Roberts
She was a witch many years before American Horror Story: Coven.