Shawn Booth & Kaitlyn Bristowe
"Let's do it like they do on the Discovery Channel. #HappyHalloween" the Bachelorette stars shared from The Jungle.
Meghan Trainor &Daryl Sabara
It's date night at Halloween Horror Nights at Universal Studios Hollywood for the "Me Too" singer and her main man.
Jessica Alba
"So many filters, so little time. Happy Halloween from @Honest!" the businesswoman wrote while celebrating in the office.
Kim Zolciak-Biermann
The Don't Be Tardy star shows off two of her children's Grease-inspired costumes.
Jessie James Decker & Eric Decker
Family photos on Halloween night don't get any cuter than this one.
Amber Rose & Val Chmerkovskiy
The rumored new couple don't disappoint over Halloween weekend.
Halsey
"It's the last day of Halloween. Happy holidays. @milliebbrown," the "New Americana" singer shared.
Garrett Clayton
The King Cobra star is a bloody mess at the Just Jared party.
Jennifer Lopez
Happy Halloween from J. Lo and Marc Anthony's twins.
Josh Murray
"The joker doesn't stand a chance against BatGirl," the Bachelor in Paradise star wrote on Instagram while playing with Amanda Stanton's kids.
DNCE
"Cruellla De Vil is coming for us pups! #happyhalloween," Joe Jonas wrote next to his band members.
Naya Rivera
"Boo bitch!" the former Glee star shared on Instagram. "Happy Halloween!!!"
Today Show
Throwback! Matt Lauer, Hoda Kotb, Savannah Guthrie and the morning show crew show off their retro-inspired costumes.
Kelly Ripa
The Live! With Kelly star shows off one of her many looks from her morning show.
Ariel Winter
The teen star channels Emma Stone's character from 2010's Easy A.
Leona Lewis
The music star gets a gold star for her costume at Matthew Morrison's Halloween Party at Hyde in L.A.
Kevin McHale
Who wears short shorts? The Glee star did at Matthew Morrison's Halloween Party presented by Freixenet Cava and Podwall Entertainment.
Colton Haynes
Game over! The Arrow and Teen Wolf star just won Halloween with his rendition of Miss Piggy.
Jessie James Decker
"Trick or treat smell my feet" and give the country singer something good to eat!
Kelly Rowland
"Been shopping with Dr. Seuss?" the singer wrote on Instagram while attending an '80s-themed Halloween party.
Demi Lovato & Nick Jonas
Dorothy found her Scarecrow and the results couldn't be better.
Lance Bass
"A last minute costume change resulted in one of my favorite looks so far!" the former 'N Sync member wrote. "I'm Elphaba and Mr. Freeze's love child Elsaba the fashion witch. #ParsonsAlum #halloweenie."
Miranda Cosgrove
It's a mini iCarly reunion as the talented group channel Scooby-Doo over Halloween weekend.
Kourtney Kardashian
"Unholy matrimony," the Halloween superfan wrote after enjoying another spooky holiday dinner.