See the best celebrity Halloween costumes of 2018

Heidi Klum as Princess Fiona from Shrek, Lupita Nyong'o as Dionne from Clueless, and Tom Kaulitz as Shrek

With Halloween upon us, some of our favorite stars are celebrating the spooky holiday by going all out with their costumes. Some are scary, some are funny, and some are downright bizarre. Check 'em out!

Tom Kaulitz as Shrek and Heidi Klum as Princess Fiona from Shrek

Lupita Nyong'o as Dionne from Clueless

Jessica Biel as LEGO Harley Quinn, Justin Timberlake as LEGO Robin, and son Silas as LEGO Batman

Rihanna as a skeleton

Reese Witherspoon, Jim Toth, and family

Mindy Kaling as a bottle of mustard and her daughter, Katherine, as a lion

Backstreet Boys: Brian Littrell, Kevin Richardson, Nick Carter, Howie Dorough, and AJ McLean

Anne Hathaway as a mummy

Eniko Hart and Kevin Hart as Minions

Mariska Hargitay and Peter Hermann as Black Widow and Captain America

Jessica Simpson and Eric Johnson as Danny DeVito and Arnold Schwarzenegger from Twins

Gisele Bundchen and daughter as unicorns

Fergie and son Axl as Power Rangers

Kelly Clarkson as a penguin and Jennifer Hudson as Catwoman

Bruno Mars as Jimi Hendrix

Joe Jonas and Sophie Tuner as Gomez and Morticia Addams

Jessica Alba, Cash Warren and family

Jenna Dewan as a fairy

Kristen Bell as Elsa from Frozen

Pink, Carey Hart, and family as The Greatest Showman

Joe Manganiello, Manolo Gonzalez-Ripoll Vergara, and Sofia Vergara

Vanessa Lachey and childen as the Incredibles

Bella Hadid and The Weeknd as Lydia Deetz and Beetlejuice from Beetlejuice

Desiree Gruber and Kyle MacLachlan

Neil Patrick Harris and David Burtka as Westley and Inigo Montoya from The Princess Bride

Winnie Harlow as RuPaul

Padma Lakshmi as Nina from Black Swan

Mike Myers and Kelly Tisdale as The Ramones

Rashida Jones and Kidada Jones as Nerds and Fun Dip

Katie Couric as Ariana Grande

Hoda Kotb and daughter as bees

Lisa Ling and daughter as mermaids

Hilaria Baldwin, Alec Baldwin, and family as astronauts

Evan Ross and Ashlee Simpson

Frankie Grande as a Troll

Questlove as a shark

Rita Ora as Alexandra from The Witches of Eastwick

Kate Moss as a vampire

Coco Austin as a ninja and Ice-T as a character from The Purge

Kat Graham as Stanley Ipkiss from The Mask

Harry Connick Jr. as a New Orleans Saints football player

Dylan Sprouse as Trunks from Dragon Ball Z and Barbara Palvin as Gaara from Naruto

Zac Posen as Willy Wonka from Willy Wonka & the Chocolate Factory

Keith Urban and Nicole Kidman as a ninja and cat

Jensen Ackles as Red Hood

Freddie Prinze Jr. as the Joker

Nina Dobrev as a unicorn

Mariah Carey and boyfriend Bryan Tanaka as a nurse and doctor

Savannah Guthrie as Cyndi Lauper, Hoda Kotb as Elton John, and Carson Daly as Bruce Springsteen

Savannah Guthrie as Cyndi Lauper and Hoda Kotb as Elton John

Hoda Kotb as Elton John

Savannah Guthrie as Cyndi Lauper

Al Roker as Doc Brown and Dylan Dreyer as Marty McFly from Back to the Future

Craig Melvin as Prince Akeem from Coming to America

Carson Daly as Bruce Springsteen

Kathie Lee Gifford as Madonna

Willie Geist as Ferris Bueller from Ferris Bueller's Day Off

Sheinelle Jones as Tina Turner

Willie Geist as Ferris Bueller from Ferris Bueller's Day Off

Carson Daly as Bruce Springsteen

Ryan Seacrest and Kelly Ripa as Major Nelson and Jeannie from I Dream of Jeannie

Kelly Ripa and Ryan Seacrest as Laverne & Shirley

Sara Gilbert as P!NK, Eve as Janet Jackson, Sharon Osbourne as Dolly Parton, and Sheryl Underwood as the Weather Girls

Rebel Wilson as Wilson the volleyball from Cast Away and Ellen DeGeneres as a Bachelor contestant

The View

Meghan McCain as Elsa from Frozen

Sunny Hostin as Okoye from Black Panther

Whoopi Goldberg as Vampirina

Ellie Kemper as Amelia Earhart

Good Morning America

Robin Roberts as Dominique Deveraux from Dynasty

Michael Strahan as Mr. T from The A-Team

Amy Robach as Peggy Bundy from Married With Children

Lara Spencer as Captain Merrill Stubing from The Love Boat

Ginger Zee as Michaelangelo from the Teenage Mutant Ninja Turtles

Rob Marciano as Zack Morris from Saved by the Bell and Ginger Zee as Michaelangelo from the Teenage Mutant Ninja Turtles

David Burtka, Neil Patrick Harris with Gideon, and Harper as characters from The Haunted Mansion

Emma Watson as Wonder Woman

Beyoncé as Toni Braxton

Ciara as Nakia from Black Panther

Jimmy Fallon as Donald Trump

Bette Midler

Jane Krakowski and Michael Kors

Marcus Scribner as Erik Killmonger, Tracee Ellis Ross as Nakia, and Anthony Anderson as T'Challa from Black Panther

Joe Jonas as Game of Thrones' Sansa Stark

Ariel Winter and Levi Meaden as Pamela Anderson and Kid Rock

Rande Gerber, Cindy Crawford, and George Clooney as an airline crew

Harry Styles as Elton John

Kendall Jenner as an Austin Powers Fembot

Camila Mendes and Lili Reinhart as Napoleon Dynamite's Pedro and Napoleon

Nina Dobrev as A Star is Born

Joey Fatone and Izabel Araujo as The Shining twins

Jessica and Jerry Seinfeld as Little Red Riding Hood and the Big Bad Wolf

Olivia Munn as Peik Lin from Crazy Rich Asians

Christian Siriano as Cleopatra

Frankie Grande

Rumer and Scout Willis as a couple of cowboys

Jaime King as Saint Joan of Arc

Madison Reed and Victoria Justice as a Ouija Board

Sarah Hyland and Wells Adams as Taco Bell

The Modern Family star dressed as a taco, while her beau dressed as Belle from Beauty and the Beast. Get it?

G-Eazy as Two-Face/Harvey Dent

Lily-Rose Depp as a ringmaster

Leonardo DiCaprio as a creepy clown

Ross Butler and Noah Centineo as Wolverine and Gaston

The actors dressed as the superhero and the Beauty and the Beast villain at the Casamigos Halloween Party.

The stars of black-ish as the cast of Black Panther

Tracee Ellis Ross, Anthony Anderson, and Marcus Scribner had fun on the set of their hit ABC comedy.

Rita Ora as Post Malone

Sean 'Diddy' Combs as a pilot

Zoë Kravitz

Cindy Crawford and Rande Gerber as David Bowie and Debbie Harry (a.k.a. Blondie)

Foo Fighters frontman Dave Grohl and wife Jordyn Blum

Prince Jackson as Jason from Friday the 13th.

Paris Jackson as a hippie

Nikki and Brie Bella as The Shining twins.

Kaia Gerber as Joan Jett

Ryan Seacrest and Shayna Taylor as Karl Lagerfeld and Anna Wintour