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Take a look at some of our fave costumes this year.

Demi Lovato

Costume: Dorothy from The Wizard of Oz

Charli XCX

Costume: Devil 

Kourtney Kardashian

Costume: Evil Queen

Scott Eastwood

Costume: Clint Eastwood

Mariah Carey

Costume: Devil 

Nick Cannon

Costume: Luigi 

Lauren Conrad

Costume: Circus performer

Joseph Gordon-Levitt

Costume: Bloody cowboy

Shakira

Costume: Magician

Seth Rogen

Costume: Mario 

Chrissy Teigen and John Legend's Daughter Luna

Instagram.com

Costume: Hot dog

Beyoncé & Blue Ivy

Costume: Salt-n-Pepa

Kendall Jenner

Costume: ?

Khloé Kardashian

Costume: Storm 

Madison Beer

Costume: Bride

Kourtney Kardashian

Costume: Dead Bride

Kylie Jenner

Costume: Christina Aguilera

Bette Midler

Costume: Her character from Hocus Pocus.

Alessandra Ambrosio

Costume: Jessica Rabbit 

Katy Perry

Costume: Hillary Clinton

Paris Hilton

Costume: Alice in Wonderland

Sofia Richie

Costume: Race car driver

Gabrielle Union

Costume: Race car driver 

Ariana Grande

Costume: Leopard

Chanel Iman

Costume: Mummy

Beyoncé, Blue Ivy & Jay Z

Costume: Barbie & Ken 

Kelly Rowland

Costume: Dionne from Clueless

Lindsay Lohan

Costume: Harley Quinn 

Hailey Baldwin

Costume: Barbie

Gigi Hadid & Taylor Swift

Costumes: Cub Scout & Deadpool