Trick or treat! Kourtney Kardashian dressed up as her sister, Kim, in the same Givenchy gown she wore to the 2013 Met Gala when she was pregnant with North.
Instagram/@kourtneykardashian
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North West dressed as the bear from Kanye West's "Graduation" album cover.
TikTok/@kimandnorth
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Megan Fox and Machine Gun Kelly dressed as "Kill Bill" characters as they attended a Casamigos Halloween party.
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Justin Bieber wore a pink-and-orange Hawaiian shirt with a snorkel and flippers.
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Paris Hilton dressed as Britney Spears from her "Toxic" music video.
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Tyga looked unrecognizable while dressed as Art The Clown.
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Kate Beckinsale donned bloody stage makeup and some shredded tights for a "Barbarella" look.
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Kaia Gerber and Austin Butler dressed as Edie Sedgwick and Andy Warhol.
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Lovebirds Cami Mendes and Rudy Mancuso shared a purr-fectly sweet smooch at Michael Braun's Halloween party.
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Jessica Alba dressed as Britney Spears from the "Toxic" music video.
Getty Images for Casamigos
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The couple dressed on another Halloween night event together.
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Happy couple Shaun White and Nina Dobrev channeled their inner rock 'n roll legends, dressing as Axl Rose and Slash as they celebrated Halloween.
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Alessandra Ambrosio showed off her toned figured in a sexy gold goddess costume.
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Paris Hilton radiates in a sultry Halloween costume.
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Cindy Crawford dressed as Sandy from "Grease."
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Julia Fox dressed as a champion fighter.
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Halsey wows in an undersea siren costume.
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Paris Jackson is off to the Shire dressed in a Hobbit costume.
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Demi Lovato is a classic channeling Snow White.
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Hearthrob Glen Powell opted for a Russian astronaut look while he dressed up for Michael Braun's Halloween Party.
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Fashion icon Jodie Turner-Smith was cute in cow print as she donned a bovine-inspired costume for Michael Braun's Halloween party..
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Dakota Fanning, Michael Braun, Dylan Meyer and Kristin Stewart (in a tropical-tourist couples' costume!) posed for a photo at Braun's legendary Halloween party.
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Ashley Benson channeled her inner "Blade" in a vampy look as she attended Michael Braun's Halloween party.
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Darren Criss looked groovy in a 70s-inspired getup at Michael Braun's Halloween party.
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Kirsten Dunst was all smiles in a skeleton suit as she and her family trick-or-treated on Halloween.
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Emily Ratajkowski looked devilishly pretty toting her son - dressed as an octopus -Â trick-or-treating in New York City.
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Charli D'Amelio dressed as Snow White.
Instagram/@charlidamelio
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Charlotte McKinney dressed up as Mia Wallace from "Pulp Fiction."
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Paul Wesley and girlfriend Natalie Kuckenburg smoldered together as they posed for a picture as they attended Michael Braun's Halloween party.
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Dylan Mulvaney made like Snow White at Bette Midler's Hulaween Gala hosted by the New York Restoration Project.
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Padma Lakshmi put a sexy spin on the Big Bad Wolf at Bette Midler's Hulaween Gala hosted by the New York Restoration Project.
WWD via Getty Images
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Chloe Bailey channeled Catwoman at Bette Midler's Hulaween Gala hosted by the New York Restoration Project.
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Kelly Ripa and Mark Consuelos dazzled in DÃa de los Muertos-inspired looks at Bette Midler's Hulaween Gala hosted by the New York Restoration Project.
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Heidi and Spencer Pratt and their kids channel the infamous superhero family for Halloween.
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The TODAY show cast dressed up for their Halloween special.
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"Love Island" host Maya Jama headed to her Halloween Party dressed as Storm from "X-Men."
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NYC Nightclub owner and restaurateur Richie Romero posed with Nick Cannon at his Sapphire 60 Sunday SINS Halloween Party.
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Alix Earle dresses as Madonna for her Marquee New York Halloween Party with Casa Del Sol Tequila
