Heidi Klum is the queen of Halloween. Her elaborate looks for her annual costume party just keep getting better.
It's not clear exactly what Martha Stewart dressed as in 2009 (Tree? Wood nymph?), but you can tell she's better at papier-mâché than you'll ever be.
Actress-model Emily Ratajkowski seriously committed to this Marge Simpson costume last Halloween.
Katie Couric was almost unrecognizable as Dolly Parton in 2013.
Leave it to Sia to wear an Easter bunny costume on Halloween in 2009.
Back in 2011, model Amber Rose played off her last name, dressing up as Guns N' Roses guitarist Slash.
Singer Mariah Carey is also known to be a Halloween party hostess.
Mariah Carey celebrating Halloween in 2003, 2004, 2008, and 2009.
Last October, model Gigi Hadid went for the classic bad Sandy from "Grease."
That's a giant Pixy Stix stick in Chrissy Teigen's hand ... maybe she was the sugarplum fairy for Halloween in 2011?
Stevie Wonder was a pretty hip skeleton in 2011.
Kim Kardashian was Little Red Riding Hood in 2010.
Bette Midler hosts a Halloween benefit gala every year, and her costumes never disappoint.
Bette Midler's costumes in 2005, 2008, and 2015.
Ice T and Coco often opt for couples costumes. Here they are in 2010 as Dr. F. Stein (get it?) and a nurse.
Actor Kyle MacLachlan sported some gruesome golf makeup in 2007.
In 2013, Dascha Polanco (of "Orange is the New Black") channeled the creepy ballerina from Black Swan.
Perez Hilton made a pretty convincing Miley Cyrus in 2013.
In 2004, a young Anne Hathaway dressed as Cleopatra.
Singer Ashanti's two most recent costumes (a belly dancer and a Smurf) show ultimate Halloween dedication.
Actor Jason Biggs was an adorable Dorothy in 2005.
Joe Jonas dressed as Derek Zoolander in 2014.
TV personality Bethenny Frankel looked glamorous as Marilyn Monroe in 2013.
Technically they're wearing normal clothes, but Jennifer Lopez and then-boyfriend Casper Smart had stunning skeleton makeup in 2015.
Actress Michelle Trachtenberg broke out serious face-painting skills for Halloween in 2011 and 2014.
Halloween spirit runs in the Jonas family: Here's Nick as the Hamburglar in 2015.
Bette Midler made every 90s child's dream come true when she dressed up as her iconic Hocus Pocus character Winifred Sanderson for her New York Halloween bash on Friday
Kylie Jenner and her boyfriend Tyga dressed up in iconic outfits from the early 2000s, attending a Los Angeles party as Christina Aguilera from her Dirrty music video and as the rapper Juelz Santana
Meanwhile Jenner's sister Kourtney Kardashian went to Tyga's party at Bootsy Bellows as a classic zombie bride
Night nurse! Ariel Winter showed off her sexy side on Sunday night as she went all out for Halloween at the Just Jared bash
Space on her mind: Leona Lewis went all out and painted herself purple as she rocked a futuristic silver alien outfit
Also in attendance at Midler's party was designer Marc Jacobs, who dressed as a female bodybuilder - complete with a six pack bodysuit, Christian Louboutin heels and a tiny blue bikini
Halloween was an early family affair for Mariah Carey and Nick Cannon, who reunited for the singer's Halloween bash
Vampire Diaries star Nina Dobrev went for the laughs with her Halloween costume, dressing up as the horse from The Revenant while her pal wore a Leonardo DiCaprio costume complete with an Oscar in hand
She also won praise the night after for her Ryan Lochte costume at Katy Perry's Los Angeles birthday party
Amy Schumer went with one of the most popular Halloween costumes this year, dressing up as Dustin from the Netflix show Stranger Things while her boyfriend Ben Hanish coordinated as the character Eleven
Floyd Mayweather took the superhero route with his Iron Man costume, writing in the caption: 'If I'm going to be any superhero, I have to be the richest superhero'
Two kingdoms unite: Singer Aubrey O'Day ruled the red carpet in a Cleopatra costume as she was joined by her Jersey Shore boyfriend Pauly D, who was her Marc Anthony
Daring: David Hasselhoff's daughter Hayley left almost nothing to the imagination in a sheer top as she joined pirate-clad pal Cassie Scerbo
Actress Jenna Dewan Tatum pulled off Pinterest's most popular costume this year as a gorgeous glittery unicorn
Olympian Ryan Lochte and his fiancee Kayla Rae Reid wore coordinating Alice in Wonderland costumes on Friday
But not every celebrity Halloween costume went off without a hitch. Hillary Duff and her personal trainer boyfriend Jason Walsh felt the wrath of the Twittersphere this weekend after they dressed up as a sexy pilgrim and Native American chief
There was no coordinating couple costume for Emma Roberts and ex-fiance Evan Peters at Kate Hudson's bash on Friday
Model Jasmine Tookes dressed as Jasmine from Aladdin at Night Of The Fallen in New York City on Saturday