Hollywood pulls out all the stops when it comes to dressing up and Halloween is no exception. And judging by Instagram, the holiday is always a smashing success.
In 2016, some families opted for group costumes: Beyoncé and Blue Ivy were Janet Jackson and Michael Jackson while Jessica Simpson and Eric Johnson dressed up as Danny and Sandy from Grease in all-black ensembles and '60s hair. Kate Upton and Justin Verlander also took on the unforgettable characters. Gigi Hadid reminded us that you can make Halloween chic, as she transformed into a Cub Scout, and Heidi Klum, who always hosts the hottest costume party of the year, multiplied herself—literally.
As if she'd known that one of 2017's biggest films would be It, Madonna dressed up as the terrorizing clown, giving us the spooks for weeks. Another favorite? Adele as Jim Carrey's The Mask?
VIDEO: The Most Unforgettable Kardashian Halloween Costumes
So how have the stars pumped up the Halloween volume this year? Vanessa Hudgens dished about her look, saying she planned to transform into Michelle Pfeiffer's Catwoman, a latex-clad masterpiece that's bound to turn heads.
Scroll to see 100 of the best celebrity Halloween costumes ever.
Adele
For Halloween 2016, the singer dressed as Jim Carrey’s The Mask from the 1994 comedy classic. Her costume consisted of a zoot suit, polka-dot tie, and a strikingly realistic mask.
Jessica Simpson, Eric Johnson, Maxwell Drew, and Ace Knute
The Johnson clan went all out for Halloween, with Maxwell dressed up as a parrot and Ace as an octopus. As for mom and dad, they looked incredible as Danny and Sandy from Grease in all-black ensembles and '60s hair.
Josh Duhamel, Fergie, and Axl Jack Duhamel
The actor opted for an Incredibles costume, while the singer and their 3-year-old son coordinated in Harley Quinn and the Joker outfits.
Beyoncé, Jay Z, and Blue Ivy
Queen Bey slayed the Halloween game as "Black Barbie" in a black-and-white striped swimsuit and retro cat-eye sunglasses. Her hubby Jay Z dressed up as Ken in a black tuxedo, while their 4-year-old daughter Blue Ivy was totally mesmerized by mom and dad.
Justin Timberlake, Jessica Biel, and Silas
The trio gave a nod to Timberlake's new movie, Trolls, by dressing up as characters from the animated film. "When you make your whole family dress up as characters from the movie you're in but your wife secretly loves it and your son won't keep his troll wig on," the musician joked.
Taylor Swift and her squad
The songstress did Halloween right with a Deadpool costume, thanks to the man behind the mask, Mr. Ryan Reynolds. Swift dressed up with squad members Martha Hunt, Gigi Hadid, Lily Donaldson, Camila Cabello, and more. "Happy Halloween from Deadpool, a Cub Scout, Martha Brady, a space cadet, a granny with a lost cat, black swan, and a birthday girl dressed as a cat," she wrote on Instagram.
Gigi Hadid
The model was an adorable Cub Scout for Halloween and dressed in a blue button-up, green velvet pants, and chukka boots. Accessories like a bandana scarf, suspenders, and a brown hat totally made the outfit.
Ariana Grande and Mac Miller
The pop star and her new beau capitalized on 2016's Pokémon Go craze by going as Eevee and Pikachu. Grande looked adorable in long ears and a fur-embellished piece.
Heidi Klum
Klum's costume was very different at her 2016 Halloween party. While she herself was recognizable, it was hard to distinguish the model from the five clones of herself that she created (with help from prosthetics).
Gabrielle Union
The Almost Christmas star looked (and felt!) sexy in a black, red, and white costume inspired by British Formula One racing driver Lewis Hamilton.
Ciara and Russell Wilson
The newlyweds and expectant parents injected humor into All Hallows' Eve by going as presidential candidate Hillary Clinton and President Barack Obama.
Jacob Tremblay
The Room breakout star and his hot dad were too cute as Maverick and a mini Maverick from Top Gun. "I feel the need for ... candy!" he hilariously captioned this photo.
Sarah Michelle Gellar
The Buffy star looked hot as DC Comics villain Poison Ivy in a green strapless mini with a tulle skirt. She completed the costume with green and black striped tights and a red wig.
Madonna
Her Madgesty took the scary route by dressing up as a terrifying clown in a mask, rendering her almost totally unrecognizable. "Clowns are people too!" she captioned this 'gram.
Gwen Stefani
The singer put a gory twist on an Alice in Wonderland costume while trick-or-treating with her sons, sporting fake blood dribbling down her chin.
Kate Upton and Justin Verlander
The engaged couple rocked their Grease costumes, making a convincing Danny and Sandy. Upton looked gorgeous with blonde ringlets in an off-the-shoulder black top, while Verlander was a stud in a leather jacket.
Hailey Baldwin
The model made the perfect Barbie, donning a pink one-piece, fishnet tights, and high socks. She completed the look with a matching headband, high ponytail, and pink pout.
Channing, Jenna Dewan, and Everly Tatum
The Tatum clan gave a nod to a Disney fave in their Beauty and the Beast costumes. "Two belles and a beast," Jenna captioned this sweet photo of the fam.
Olivia Culpo
The brunette beauty donned an adorable monkey headpiece and matching brown lip on Halloween night. "No monkey business!!" she wrote.
Katherine Heigl
The Grey's Anatomy alum and her daughters dressed as blood-thirsty vampires feeding on the Beast, aka her hubby Josh Kelley. "It was a wicked night for the Kelley girls," she wrote.
Vanessa Hudgens
The High School Musical alum took the plunge in a lace-up black bodysuit as a scary skeleton. Her boyfriend Austin Butler joined her in matching face paint, making for one terrifying un-dead couple.
Alec Baldwin
The actor and his adorable clan were caped superheroes on Halloween: They dressed as the family from The Incredibles.
MIndy Kaling
The actress was a protective godmother on Halloween, dressing up as the beekeeper to her godson's bee.
Gisele Bündchen and Benjamin
The model hilariously dressed up as the Luigi to her son's Mario and donned a green hat, overalls, and a mustache. "When your son wants to be super Mario but no one wants to be Luigi. This is what you do," she joked.
New Girl Cast
The cast of Fox's hit show got into character on Halloween by recreating the players of American Crime Story: The People v. O.J. Simpson. Zooey Deschanel was a spot-on Marcia Clark, while Lamorne Morris dressed up as Christopher Darden. Jake Johnson was Robert Kardashian, Hannah Simone was Judge Lance Ito, and Max Greenfield rounded out the pack as Robert Shapiro.
Lindsay Lohan
The Mean Girls star was an impeccable Harley Quinn on Halloween. She channeled the Suicide Squad character with dip-dyed pigtails, wacky makeup, a blue and red bomber, and, of course, a baseball bat.
Beyoncé, Blue Ivy Carter, and Tina Knowles
Three generations of the Knowles family crushed the 2016 Halloween game with these Salt-N-Pepa-inspired costumes. Bey channeled Sandra "Pepa" Denton, while Tina and Blue dressed up as Deidra "Dee Dee" Roper and Cheryl "Salt" James from the "Push It" music video.
Kylie Jenner
In 2016, the youngest Kar-Jenner nailed her Christina Aguilera "Dirrty" costume, complete with extra-long dip-dyed hair extensions and facial piercings. Kylie showed off her killer bod in a red-and-white striped bikini top, cheeky red shorts, and matching chaps.
Kendall Jenner
The model proved that even a simple costume can be totally sexy with her plunging latex dress, thigh-high stockings, and combat boots. She completed the killer look with black lipstick, layered chokers, and a waist-defining corset.
Naomi Watts
Watts celebrated the haunted holiday with two little ones in tow: She went spooky as a bloodied ballerina, while the kids were a dead bride and a beheaded man.
Bette Midler
Midler got nostalgic for Halloween and resurrected her character Winifred Sanderson from the beloved classic Hocus Pocus.
Jessica Alba
The actress pulled off the ultimate BFF costume with her friend Kelly Sawyer, dressing up as Patsy and Edina from the movie, Ab Fab—wine bottles in hand!
Kourtney Kardashian and kids
For one of many Halloween costumes this year, Kourtney rocked a red and white Power Ranger suit. Mason, 6, wore a black ensemble, while 4-year-old Penelope looked cute in pink and 1-year-old Reign was an adorable red Ranger.
Jennifer Lopez's Kids
Eight-year-old Emme rocked a fierce catsuit for Halloween, while her twin, Max, went as Bowser from Mario. "HAPPY HALLOWEEN," Lopez captioned the cute photo.
Nicole Richie
The fashion designer and her friend went as magicians Siegfried and Roy in sparkly outfits and glitzy gold leggings.
Neil Patrick Harris and family
The How I Met Your Mother star and his clan may have pulled off the best group costume yet. Six-year-old Harper made a fierce Marilyn Monroe, while proud pops Harris and David Burtka dressed as Groucho Marx and Charlie Chaplin. Harper's twin, Gideon, rounded things out as a handsome James Dean.
Ivanka Trump's kids
Five-year-old Arabella and 3-year-old Joseph dressed up as characters from the Disney Junior series PJ Masks, while 7-month-old Theodore looked adorable as Mickey Mouse.
Martha Hunt as Elvira Hancock from Scarface
The look for less:
When the Moons Out Maxi Dress ($20; nastygal.com)
Wear it forever:
Michelle Mason Strappy Wrap Gown ($897; farfetch.com)
Kylie Jenner and Tyga
Jenner got an early start on All Hallows' Eve and rang in the spooky holiday with a "Dead Dinner" at her house. The 19-year-old went as a sexy contoured skeleton, while her boyfriend, Tyga, was unrecognizable in an all-black outfit and creepy skeleton makeup.
Cindy Crawford and Family
The supermodel and her stunning family pulled off the ultimate group costume by dressing in head-to-toe punk rock outfits. Crawford accessorized her wild look with orange highlights, while her look-alike daughter Kaia Gerber went glam in a pink bouffant and black winged eyeliner. Her son, Presley Gerber, slicked back his brown hair, while dad Rande showed off blue spikes.
Shay Mitchell
The Pretty Little Liars star channeled her inner biker chick in a "last minute" costume.
Kourtney Kardashian
Somehow, this mom of three made her dead bride costume look utterly sexy in a short lace dress and thigh-high white stockings.
Kate Hudson
The star went retro for Katy Perry's '50s-themed bash and showed off her incredible abs in a crop top and printed skirt.
Katy Perry
The pop star was unrecognizable as presidential hopeful Hillary Clinton with prosthetics, a blonde wig, and a red pantsuit.
Khloé Kardashian
The reality star was a totally convincing Storm from Marvel's X-Men and looked fierce with silver hair and light colored contacts.
Victoria Justice
The Rocky Horror Picture Show star nailed her Beetlejuice costume in a green-tinted wig, dark lipstick, and a sexy striped outfit.
Katy Perry and Orlando Bloom
The hot couple coordinated at Perry's "Hudson High" birthday party. Perry went as "Principal Hudson" for the Grease-themed bash with a high yellow bouffant 'do, while Bloom looked adorable in a red letter jacket and short gym shorts.
Alessandra Ambrosio
The model gave us costume inspo as Jessica Rabbit and showed off her amazing bod in a strapless sequined high-slit gown. She paired the look with a matching wig, purple gloves, and pointed-toe pumps.
Ariel Winter
The Modern Family star made spooky look sexy as a zombie nurse. She paired contoured white and red face makeup with a white wig and a nurse costume for the creepy costume.
Halle Berry
Berry went all out as a skeleton for Halloween: She wore realistic face paint and a wild red wig with her black and white costume.
Bella Thorne
The actress pulled out all the stops for a zombie cheerleader costume and showed off her killer abs in the process.
Amy Schumer
The comedian and her boyfriend Ben Hanisch among the many friend groups who went as the children from the summer's hit Netflix series Stranger Things. But instead of dressing up as Eleven herself, Schumer hilariously gave her boyfriend the honor.
Demi Lovato and Nick Jonas
The longtime friends and recent tourmates took a walk down the yellow brick road as Dorothy and the Scarecrow from The Wizard of Oz.
Jenna Dewan Tatum
This sparkle enthusiast made all our glittery unicorn dreams come true with an epic, Pinterest-worthy costume. Dewan Tatum painted her hair silver and added colorful extensions for a long ponytail "mane," then glammed up her face with major sparkle and topped off the look with a unicorn horn.
Nina Dobrev and Taylor Lautner
These stars had the same idea of dressing up as silver-haired Ryan Lochte from the 2016 Rio Olympics. Lautner showed skin in a half-zipped warm-up jacket while Dobrev went all in with a "shirtless" tee.
Mindy Kaling
Leave it to the pop-culture-savvy Kaling to make her Halloween costume timely. The Mindy Project star went as Tom Hanks as Captain Sullenberger from the 2016 movie, Sully.
Jacob Tremblay
Proving once again that he's wise beyond his years, the Room star dressed as Marty McFly from Back to the Future. "Only the adults knew who I was," he joked on Instagram.
Demi Lovato, Jennifer Lopez and Iggy Azalea
Rapper Iggy Azalea (far right) showed she has quite the sense of humor. After Snoop Dogg said she looked like Marlon Wayans of White Chicks, she dressed up as the character for Halloween 2014. Certainly she had Demi Lovato (far left), who went as Lucille Ball, laughing. She posted this picture to her Instagram saying, "Me, @jlo & @thenewclassic who had me dying tonight with that costume."
Debra Messing
Neil Patrick Harris
Hailee Steinfeld and Sarah Hyland
Adriana Lima
Kelly Osbourne
North West
Nina Dobrev
Rita Ora
Rihanna
Gwen Stefani and Gavin Rossdale
Lea Michele
Kim Kardashian and North West
Kim Kardashian
Beyonce and Blue Ivy
Taylor Swift
Heidi Klum
Kate Hudson and Goldie Hawn
Katy Perry
Kate Hudson
Naya Rivera
Kourtney Kardashian
Kelly Osbourne
Cara Delevingne
Lucy Hale
Cindy Crawford
Molly Sims
Ashley Madekwe
Michelle Trachtenberg
Miley Cyrus
Jessica Simpson
Lauren Conrad
Kate Upton
Ashley Tisdale
Molly Sims
Iggy Azalea
Melissa McCarthy and Sandra Bullock
Tom Brady and Gisele Bündchen
Kelly Ripa and Michael Strahan
