Boo!
This pop star is completely unrecognizable beneath a ghost sheet.
Lady Gaga
Rainbow Bright
This Halloween lover has really taken things to a new level with her butterfly costume!
Heidi Klum
The Bride in Black
We bet you can't guess which Grammy winner is beneath this Dia de los Muertos-inspired costume!
Adele
Looking Grrrrreat!
This TV hottie sure knows how to turn heads!
Colton Haynes
Dark Side
Which starlet channeled her dark side in this creepy costume?
Liberty Ross
Possessed Zombie
This terrifying costume will haunt you in your sleep! Can you guess which star made this unbelievable transformation?
Demi Lovato
Grandma's Still Got it
Who invited grandma to the party? You'll never figure out who transformed themselves for this costume!
Heidi Klum
Deadly Marriage
Marriage is scary, but we didn't realize it could be this deadly! Can you guess who this spooky bride and groom are?
Padma Lakshmi & Susan Sarandon
Sock Monkey
There was plenty of monkeying around in this costume! Can you guess the celeb behind the get up?
Isla Fisher
Class Clown
This not-so-funny clown is here to trick the treats right out of you. Which celeb dressed up as everyone's worst nightmare?
Lance Bass
American Psycho
Which star decided to channel Christian Bale's creepy, on-screen character for Halloween?
Scott Disick
Your Worst Nightmare
This frigtening remake of Nightmare Before Christmas couldn't be any more perfect, but which celebrity is behind the creation?
