14 Celebrity Halloween Costumes That Are So Good, You Won't Even Recognize The Famous Person Underneath Them

Halloween is upon us, folks! And celebs have already started showing off their incredible costumes.

hailey beiber with a lace outfit and a skeleton prop
@haileybieber / instagram.com

And honestly, nothing excites me more than seeing celebs go SO hard with their costumes that I have to guess who's actually wearing it. So, to celebrate spooky season, let's take a trip down memory lane and see 14 celebs who were totally unrecognizable in their costumes over the years:

1.This Hillary Clinton is actually...

hilary and bill clinton with secret service
BACKGRID

...Katy Perry.

closeup of katy
Dimitrios Kambouris / Getty Images for Tiffany & Co.

2.This giant worm is actually...

a giant worm costume at an event
Taylor Hill / Getty Images

...Heidi Klum.

closeup of her
Gotham / FilmMagic

3.This Beetlejuice is actually...

beetlejuice sitting down holding a drink
Craig Barritt / Getty Images for SVEDKA Vodka

...The Weeknd.

closeup of him posing at an event
Andreas Rentz / Getty Images

4.This Mary-Kate and Ashley Olsen is actaully...

closeup of the two at an event
Noam Galai / Getty Images for Heidi Klum

...Neil Patrick Harris and David Burtka.

closeup of them at an event
Gotham / FilmMagic

5.This Karl Lagerfeld is actually...

the person in custome holding a fan and wearing a grey wing
Amy Graves / Getty

...Josh Duhamel.

closeup of him at an event
Cindy Ord / Getty Images

6.This Donald Trump is actually...

  The Hollywood JR / BACKGRID
The Hollywood JR / BACKGRID

...Orlando Bloom.

closeup of him
Mike Marsland / Mike Marsland / WireImage

7.This Pennywise is actually...

...LeBron James.

lebron on the court during his game
Jim Poorten / NBAE via Getty Images

8.This Sally from The Nightmare Before Christmas is actually...

sally on the red carpet
Jemal Countess / Getty Images

...Michelle Trachtenberg.

closeup of her at an event
Leon Bennett / WireImage

9.This Post Malone is actually...

someone as post with his tattoos, cigarette, and holding a bottle of bud light
Gareth Cattermole / Gareth Cattermole / Getty Images

...Rita Ora.

closeup of her
Dave Benett / Dave Benett / Getty Images for Burberry

10.This witch is actually...

wearing a long lacy and layered dress with long messy hair
Niki Nikolova / FilmMagic

...Chloë Grace Moretz.

closeup of her at an event
Marc Piasecki / WireImage

11.This bloody zombie is actually...

wearing a bloodied dress with bloody makeup
Christopher Polk / Getty Images

...Demi Lovato.

closeup of her at the mtv awards
John Nacion / WireImage

12.These lifesize primates are actually...

two apes
D Dipasupil / FilmMagic

...Heidi Klum and Seal.

the two on the red carpet
Nbc / NBCU Photo Bank / NBCUniversal via Getty Images

13.This Frankie Stein from Monster High is actually...

his and her frankensteins
Christopher Polk / Getty Images

...Shenae Grimes.

closeup of her
Amy Sussman / Getty Images

14.And finally, this Princess Fiona is actually...

princess fiona at a party
Stefanie Keenan / Getty Images for Freixenet

...Colton Haynes.

closeup of him in a suit
Catherine Powell / Getty Images for MTV