"Harley Quinn at your service," the model wrote. "Want to be my #puddin?"
"@elviecreations nailed the Gus Gus & Jaq costumes!!" Hayley Hubbard wrote on Instagram. "We searched high and low on Etsy and scoured the internet and every local seamstress and Laura came through with the winning costumes for Luca and Altas."
"Do you prefer fashion victim or ensembly challenged??" the Olympian wrote on Instagram. "#clueless #asif #cluelesscostume #happyhalloween."
The singer channels the late Amy Winehouse.
The couple pays tribute to the Lizzie McGuire Movie while attending the Casamigos Halloween party.
The group reenacts Michael Jackson's "Remember the Time" music video.
Bloody adorable.
We spy an Ice Princess at Darren Dzienciol's CARN*EVIL Halloween party presented by DECADA!
The three pay tribute to The Queen's Gambit.
Someone looks like The Powerpuff Girls' Sara Bellum at the CARN*EVIL Halloween party powered by Geojam.
"Nobody puts baby in the corner," the actress joked on Instagram. "#happyhalloween from Baby Houseman and Johnny Castle #dirtydancing #loverboy."
The star rocks a sexy style at the CARN*EVIL Halloween party.
The comedian does his best portayol of The Weekend.
Spooky! The actress steps out for Darren Dzienciol's CARN*EVIL Halloween party.
The bride-to-be makes one sexy Cinderella.
We spot a pirate exiting Darren Dzienciol's CARN*EVIL Halloween party, featuring catering by Butter Bun.
The Little Mix star channeled Marge Simpson at Maya Jama's annual Halloween party.
"Happy Halloween from me & my pet spider. Do you think I can get away with making this hat an every-day accessory?" the actress shared, to which her boyfriend Jonathan Scott replied, "Oh I think you can get away with just about anything."
The pop star recreated Anna Nicole Smith's infamous wedding for Halloween, writing on Instagram, "Icon Anna Nicole Smith getting married to J. Howard Marshall II. Happy Halloween Eve."
The actress quipped, "There's something wrong with the birds!"
The host herself went above and beyond with her costume to celebrate her annual fête in London.
The Queer Eye star was in good spirits as he attended Bette Midler's New York Restoration Project's Annual Hulaween Gala.
The Riverdale star got into a Matrix mood, writing on Instagram, "You have to understand, most of these people are not ready to be unplugged. And many of them are so inert, so hopelessly dependent on the system that they will fight to protect it."
"Ready for takeoff #happyhalloween," the supermodel shared.