With each year comes another group of celebs going all out for Halloween, and 2015 is no exception. Even before the holiday itself arrives, people are dressing up and sparing no expense, vying to prove themselves the Halloweeniest. With all the stiff competition, we're here to document the best of the best. From Beyoncé to the Kardashians, check out the incredible costumes of 2015 below!

Kim Kardashian

We have a winner, everyone. Pregnant Kim Kardashian pulled from her own closet to recreate her iconic Met Gala 2013 look. Nailed it.

Pauly D

Surprisingly, Kim wasn't the only celeb to dress as themselves this Halloween -- Pauly D also channeled an old look of his.

Beyoncé, Jay-Z and Blue Ivy

Possibly inspired by all of the "Coming To America" chatter around her Met Gala outfit, Beyoncé, Jay and Blue dressed as Queen Aoleon, King Jaffe Joffer, and Imani Izzi respectively.

Heidi Klum

Per usual, Heidi Klum went above and beyond with her Halloween costume design, becoming completely unrecognizable as herself and 100% creepy dead ringer for Jessica Rabbit from "Roger Rabbit." Bravo, Heidi!

Katy Perry

She literally dropped the mic this year. How do you even contend with that?

Nicki Minaj

Nicki became a "fairy fking princess" this year and put a little sparkle in all of our lives.

Miley Cyrus

Miley opted for the Disney Princess with a twist approach and found her Prince Charming with four legs.

Kylie Jenner

Kylie Jenner went as a sexy eskimo for Halloween and it kinda reminded us of Frostbyte from Taylor Swift's "Bad Blood" video.

Kylie Jenner (again)

Of course, Kylie would have two Halloween costumes. She later went as a warrior princess with some ninja sidekicks because some people don't have to pick just one.

Kendall Jenner

Kendall, the model of the family, went for a very ~fashion~ costume: Lady Karl Lagerfeld, for which she also enlisted a friend to dress up as Karl's famous cat Choupette.

Max Carver and Holland Roden

Also going the fashion route, "Teen Wolf"'s Max Carver and Holland Roden used blow up dolls to dress as the Spring/Summer 2016 Rick Owens runway show. Not the most recognizable reference, but for those who knew, it was an expert execution.

Jessica Alba

Romy and Michelle had their high school reunion by way of Jessica Alba's Halloween costume, and the only thing missing was a stack of Post-its.

Kat McNamara

A guaranteed favorite for any 2000s kid, Kat McNamara dressed as Kim Possible.

Tinashe

Bow wow wow, yippie yo yippie yay -- Tinashe straight up slayed this Snoop Dogg costume, dookie rope chain and all.

Snoop Dogg

And Snoop dressed up as an actual dog. A pug to be exact.

Ryan Reynolds

Ryan Reynolds admitted to swiping the "Deadpool" costume he wears in the movie, so this Halloween he suited up as the merc with a mouth because, as Deadpool would say, why the f--k not?!

Gigi Hadid

We've got chills and they're multiplyin' over Gigi Hadid's Sandy from "Grease" ensemble. ???

Justin Bieber

Justin wore his best orange afro for his Jackie Moon costume.

Joe Jonas

Also taking a page from the Will Ferrell book of cinema, Joe Jonas replicated Chazz Michael Michaels' look from "Blades of Glory."

Channing Tatum and Jenna Dewan-Tatum

The Tatums opted for the kid-friendly approach to Halloween this year, becoming Dr. Seuss' "Cat in the Hat" times two. Chan's favorite part? "Jenna's tiny hat. Makes me laugh every time."

Fergie and Josh Duhamel

Fashion lovers, rejoice! Fergie and Josh Duhamel had the ultimate Chanel-o-ween as Karl Lagerfield and his beloved kitten Choupette. Meow this is how it's done.

Victoria Justice

Victoria paid tribute to one of her "favorite artists ever," Amy Winehouse.

Neil Patrick Harris

The Force was with this family for their Halloween costume quartet.

LeBron James

There might be no better validation of your Halloween costume than having the actual person you dressed as post it to Instagram, which is exactly what happened for LeBron James thanks to Prince (and Princestagram).

Karrueche

The same kind of love was given to Karrueche who expertly paid homage to Lil Kim and her "Crush On You" music video.

Ciara

Ciara threw a superhero costume party for her birthday and dressed up as Catwoman in a black latex bodysuit.

Beyoncé

Beyoncé was somehow the least recognizable celebrity there, dressing up as Storm -- creepy contacts and all.

Lily Collins

Lily Collins opted for a frilly Superwoman getup, cape included.

Kourtney Kardashian

Though Kourtney Kardashian and her family didn't attend Ciara's party, they definitely would have fit in with their superhero costumes.

Nick Jonas

Nick Jonas somehow managed to make the Hamburglar seem hot, and we are not mad about it.

Sarah Hyland

Sarah Hyland attended Matthew Morrison's Halloween party dressed like some cat/ballerina hybrid.

Nina Dobrev

Nina Dobrev channeled her inner Posh Spice while going out with a group of friends dressed as the Spice Girls.

Colton Haynes

Yes, that is Colton Haynes dressed as Ursula. No, you cannot unsee it.

Josh Peck and John Stamos

Josh Peck and John Stamos both dressed up as devils, though John seems a little more committed with his all-red ensemble.

Lauren Conrad

Because Lauren Conrad is crafty and great at Halloween, she chose to be a party animal, and nailed it.

Katie Stevens

Adorable and comfortable, Katie Stevens went for an uncommon Halloween animal: a sloth.

Brody Jenner

Brody Jenner wore a beer belt and, more importantly, overalls with no shirt for his "hill billy" costume.

Chris Brown

This one might give you a little double take, but trust that is Chris Brown dressed as post-werewolf Michael Jackson in "Thriller" under that mask.

Rita Ora and Kyle De'volle

And yes, that is Rita Ora and her bestie Kylie De'volle under those Bananas in Pajamas suits.

Austin Butler and Vanessa Hudgens

Austin and Vanessa did their best Pulp Fiction impression, which involves Austin in a bolo tie and is totally cool with us.

Chrissy Teigen

Chrissy Teigen remains perfect, even with spiked Guy Fieri hair.

Demi Lovato

Demi's version of a Trap Queen is an actual queen of traps. Touché.

Heidi Montag and Spencer Pratt

A family affair.

Snooki, Jionni, and family

Not to be outdone, Snooki, Jionni and fam also channeled their respective light and dark sides.

5SOS

The band changed their name briefly for Halloween to 5 Seconds of Sexx, transforming themselves into an '80s hair band.

Lindsay Lohan

Lindsay dressed up as a cat...that was also a vampire?

Ariana Grande

Ariana chose to be a cow because, like she told Ellen Degeneres, she "figured it'd be cute."

Adam Lambert

I'll be honest, I'm not entirely sure what Adam Lambert is dressed as, but it's definitely terrifying.

Ellen Degeneres

Naturally, Ellen dressed up as lesser known Kardashian sister, Karla.

Hugh Jackman

Hugh Jackman put away the Wolverine claws and suited up as a Nintendo favorite for Halloween. It's a-Mario!

Kat Graham

Kat ditched the whole vampire scene and went straight for ancient Egypt for her lady pharaoh look. In her words, she's "Straight outta Kemet."

Gwen Stefani

Bloodied cowgirl? That is B-A-N-A-N-A-S.

Reese Witherspoon

Reese was clearly inspired by the ancients for her festivewear this year.