To some people, Halloween is a good excuse to wear their most outrageous outfit… To others, it’s serious business.

For some of our favorite celebrities, Halloween is VERY serious business. They bust out the fake blood, the wigs and the prosthetics to mark the spookiest day of the year. This year was no exception, with some fairly unforgettable Halloween costumes making an appearance. While some stars stuck to the basics – skeleton costumes or sexy lingerie, others went all out in their celebrations!

If you miss Halloween already, here is something that will help prolong the spirit: the best celebrity Halloween costumes of 2015.

Heidi Klum

No one can deny that Heidi Klum is the queen of Halloween. But this year, the supermodel took it to the next level with her Jessica Rabbit costume.

Jessica Alba

In our favorite throwback of the year, Jessica Alba and her BFF donned the iconic dresses from Romy and Michele’s High School Reunion!

Dwayne "The Rock" Johnson

Ever wondered how The Rock manages to be so fit and strong? Well, it’s obviously because he eats his spinach!

Emily Ratajkowski

Marge Simpson just got hotter! Emily Ratajkowski channeled everyone’s favorite animated mom to perfection.

Fergie & Josh Duhamel

There are few things as entertaining as couple’s costumes. And if there’s one couple that knows how to do it right, it’s Fergie and Josh who dressed up as Karl Lagerfeld and his cat, Choupette.

The Burtka-Harris Family

Their commitment to Halloween is just one of the many things we love about the Burtka-Harris family. This year’s Star Wars costumes were just as amazing as we expected.

North West & Penelope Disick

North West and Penelope Disick are the cutest cousins ever. This Halloween, the adorable little girls dressed up as Elsa and Anna from Frozen. Aww!

Taylor Swift

Nori and Penelope aren’t the only ones who fan-girled over Frozen, this Halloween. Taylor Swift, who dressed up as Olaf, invited Let It Go singer Idina Menzel to join her on stage. Talk about commitment to costume!

Gigi Hadid

In her now iconic black attire, Sandy from Grease was simultaneously super hot and uber cool. Gigi Hadid, who dressed up as Olivia Newton John’s iconic character, certainly nailed that part of the costume.

Katy Perry

Katy Perry sure knows how to drop it like it’s hot. It’s, therefore, no surprise that the pop star dressed up as a literal mic drop for Halloween!

Kelly Ripa

Kelly Ripa killed Halloween 2015 with all of her amazing costumes. If we had to pick one favorite, it would be her attempt to break the Internet!