Heidi Klum is known for taking her Halloween costumes very seriously.

There was that time she dressed as an old lady. And the time she dressed as the Goddess Kali.

This year, she pulled out the big guns again with her Jessica Rabbit costume that left her looking entirely recognisable.

In case you were wondering how to pull off this look yourself, you may be deterred after seeing the preparation process. It looked lengthy and very, very uncomfortable.

Although Heidi’s costume was incredible, she had some impressive competition.

Check out which American celeb went as a tooth and the famous Hollywood couple who dressed as Karl Lagerfeld and his pet cat, Choupette (yes… that happened):

U.S. Celebs get scary for Halloween 2015

Heidi Klum

Heidi Klum

Channing Tatum and wife Jenna Dewan

Neil Patrick Harris and the family "A long time ago in a Halloween far, far away...."

Nicki Minaj as a Fairy.

Victoria’s Secret Model, Romee Strijd as a Zombie.

Lena Dunham kept it real for Halloween, pimple and all (and we love her for it)

Miley Cyrus as a tooth

Kylie Jenner as a ‘Snow Princess’

Jessica Alba and Kelly Sawyer as Romy and Michelle

Jessica Alba also as a cat...

Justin Bieber as Jackie Moon

Ellen Degeneres as Karla Kardashian

Gisele Bundchen’s sons dressed up as Nemo and The Hulk

Heidi Klum’s outfit involved prosthetics…

Heidi Klum’s new face

Gwen Stefani as a bloodied Cowgirl

Josh Duhamel as Karl Lagerfeld and Fergie as pet feline Choupette

Cindy Crawford and Rande Gerber as Hells Angels

Chrissy Teigen as Guy Fieri

Beyonce with some cool-as-heck white eye contacts

Kardashian kids North West and Penelope Disick as characters from Frozen