How Taylor Swift, Kim Kardashian & More Celebs Celebrated Halloween — PHOTOS

Nov. 1 isn't just the start of a new month — it's a day used to reflect on all of the mishaps and mayhem that took place over Halloweekend. All your favorite celebrities joined in on the Hollywood fun, giving fans a look into their wild nights with pictures of their elaborate costumes on their social media. Earlier in the weekend, stars like Lucy Hale and Nick Jonas wowed us with their outfits, and today, favorites like Taylor Swift and Gigi Hadid showed off their own, leading the pack in a round up of the best celeb Halloween costumes of 2015.

Whether they were stepping on-stage or just onto the scene, plenty of movie, TV and music stars put on a show with their extravagant costumes. Earlier in the weekend, Nicki Minaj made the transformation into a rhinestone clad fairy, Kourtney Kardashian went from super mom to Wonder Woman, Justin Bieber became a ballin', red afro-wearing Jackie Moon, Ariana Grande became an adorable, sunflower-wearing cow, and Jessica Alba helped bring back Romy and Michele's High School Reunion with one of her girlfriends. How could anyone even dare to one-up these get ups? Well, other celebs brought their A-game as well, and showed that you're never too cool to dress up for Halloween. Here's how their Saturday night costumes went down:

Anne Hathaway

The actress partied with The Vampire Diaries star Nina Dobrev, and rocked a pink unicorn onesie with magical hair and makeup.

Katy Perry

Mic. Drop.

Joe Jonas

The "Cake By the Ocean" singer channeled his inner Will Ferrell last night, wearing a Chazz Michael Micahels costume reppin' Team USA and the whole she-bang.

Kim Kardashian

Kim Kardashian just pulled a total Kim Kardashian and I love her for it. She took a ride on the virtual side and dressed up as a spitting image of her character from her app, dressed in that memorable Met Gala dress.

Taylor Swift

Taylor Swift celebrated Halloween with the thousands of Swifties that showed up to her 1989 Tour stop and her special guest for the night, Idina Menzel, for a rendition of the Frozen song "Let it Go," all while wearing an Olaf costume.

Amanda Seyfried

This actress showed that classic will never go out of style. Her authentic, OG witch costume was on point from head to toe, and she even got her dog dressed up for the occasion as well!

Kylie Jenner

The TV personality and social media megastar ditched her bright locks and made a return to her dark do for her fierce costume, smolder and all.

Heidi Klum

The acclaimed supermodel and Project Runway star was completely unrecognizable last night, taking on a full transformation into Jessica Rabbit for Halloween. Klum documented her step by step transformation on Instagram for her devoted followers, grabbing people's attention from the very first vid. It clearly was a #heidihalloween!

Gigi Hadid

The new addition to the Victoria's Secret Fashion Show squad had every reason to celebrate this Halloweekend! She slayed the game as Grease's Sandra Dee.

Ryan Reynolds

Ryan Reynolds did it right, per usual. Every smart superhero has a posse.

Channing Tatum

If Channing Tatum isn't your everything goals, then you are doing it wrong.

Kendall Jenner

Leave it to a supermodel to dress up as fashion's number one leader, Karl Lagerfeld.

Dwayne "The Rock" Johnson

The costume may be a bit small, but I'm not complaining.

In a crowd full of standouts, how does a celeb stand out on Halloween? Whatever the secret is, these celebs seem to have mastered the art. I hope these costumes gave you all the inspiration that you need for holiday outfits to come.