Taylor Swift borrows Ryan Reynolds' Deadpool costume and more stars dressing up for Halloween

Taylor Swift borrowed Ryan Reynolds' Deadpool costume from his Marvel flick for a Halloween party in NYC with her girlsquad, which included Martha Hunt, Gigi Hadid, Lily Donaldson and Camila Cabello. Photo: Instagram/@taylorswift

Scout's honor! Gigi Hadid opted for a girl scouts costume while her best friend Taylor Swift channeled her inner superhero as pal Blake Lively's husband's Marvel character, Deadpool. Attached to the Polaroid snap, the 1989 singer wrote, "Thanks @vancityreynolds for this costume, you're the BEST deadpool inside contact ever." Photo: Instagram/@TaylorSwift

If you say her name three times, she will appear! Victoria Justice put her own spin on the Beetlejuice look during the Just Jared Halloween party sponsored by Maestro Dobel Tequila in L.A. Photo: Owen Kolasinski/BFA.com

Paris Hilton was Superwoman during the Just Jared Halloween party sponsored by Maestro Dobel Tequila in L.A. Photo: Owen Kolasinski/BFA.com

John Stamos was dressed as one scary Mickey Mouse at Mickey's Halloween Party held at Disneyland. Photo: Instagram/@mickeymouse

Looks like Paris Hilton does "believe in fairy tales." The heiress made a chic Tinkerbell. Photo: Instagram/@parishilton

More like sleeping beauty! Jenna Dewan-Tatum made one beautiful Belle. Channing's wife captioned the post-festivities photo, "Belle down." Photo: Instagram/@jennaldewan

Joe Jonas and his DNCE bandmates (JinJoo Lee, Cole Whittle and Jack Lawless) got into formation as dalmations for Halloween. The singer shared a photo of his group's Disney-movie inspired costumes writing, "Cruellla De Vil is coming for us pups!" Photo: Instagram/@joejonas

Good Morning America's Lara Spencer didn't blow her shot as Alexander Hamilton. Photo: Instagram/@goodmorningamerica

Uncanny! Nina Dobrev rocked the Ryan Lochte costume at Matthew Morrison´s 7th Annual Halloween-Birthday Party presented by Freixenet Cava and Podwall Entertainment at Hyde Los Angeles. Photo: Splash

The hosts of the Today Show paid homage to the '90s in their over-the-top costumes. Photo: Instagram/@todayshow

Even though it was the Night of the Fallen Angels, these Victoria's Secret Angels were thriving during their party at Marquee NYC. Inside, Lais Ribeiro¸ Martha Hunt, Sara Sampaio, Romee Strijd, Jasmine Tookes, Josephine Skriver partied the night away to the sounds of DJ M.O.S., DJ Politik and Mel DeBarge. Photo: Matt Enbar

Chace Crawford and girlfriend Rebecca Rittenhouse dressed up as Richie and Margot Tenenbaum at Matthew Morrison´s 7th Annual Halloween-Birthday Party presented by Freixenet Cava and Podwall Entertainment at Hyde Los Angeles. Photo: Splash

Kelly Ripa and Jerry O'Connell made a great Harley Quinn and Joker. Photo: Instagram/@kellyripa

BFF's Demi Lovato and Nick Jonas were off to see the Wizard as Dorothy and The Scarecrow for their Halloween festivities. Photo: Instagram/@nickjonas

It's morphin' time! Kourtney Kardashian and her kids Penelope and Mason Disick dressed up as Power Rangers. Photo: Instagram/@kourtneykardash

Power couple! Khloe Kardashian and beau Tristan Thompson were the dynamic duo as Storm and the Black Panther at the Cleveland Cavaliers' Halloween party. Photo: Instagram/@khloekardashian

A common trend, Taylor Lautner also dressed up as Olympian Ryan Lochte for Mathew Morrison´s 7th Annual Halloween birthday extravaganza presented by Freixenet Cava and Podwall Entertainment at Hyde Los Angeles. Photo: Splash

Candace Cameron Bure looked magical as Tinker Bell. Photo: Instagram/@candacecbure

Things got spooky for Miranda Cosgrove and Jennette McCurdy's crew as they went as the gang from Scooby Doo. Photo: Instagram/@mirandacosgrove

Kourtney Kardashian and Steph Shep made one unlucky bride and groom. Photo: Instagram/@kourtneykardash

Ryan Lochte and Kayla Rae Reid were ready for a Casamigos party as the Mad Hatter and Alice. Photo: Instagram/@ryanlochte

Halle Berry and her daughter Nahla Aubry "killed it" in their skeleton costumes. Photo: Instagram/@halleberry

Jump back! Bette Midler channeled her character Winifred Sanderson from Hocus Pocus for her Halloween bash in NYC. Photo: Instagram/@bettemidler

Kate Hudson and Katy Perry (aka Principal Hudson) put on their best 1950s glam for the Rise singer's sock hop inspired 32nd birthday. Photo: Instagram/@katehudson

Jessica Alba, her husband Cash Warren and their crew were ready for detention during Katy Perry's sock hop inspired birthday party. Photo: Instagram/@jessicaalba

Colton Haynes was the prettiest pig in the city in a Miss Piggy costume. Photo: Instagram/@coltonhaynes

Mindy Kaling was ready to take flight (and take notes from Tom Hanks) as hero airline captain Capt. Chesley "Sully" Sullenberger. Photo: Instagram/@mindykaling

Teyana Taylor and Iman Shumpert were crazy in love as Harley Quinn and The Joker. Photo: Instagram/@teyanataylor

Nicole Richie and her squad kept it magical as Vegas performers Siegfried and Roy. Photo: Instagram/@nicolerichie

Emily Ratajkowski made a grand entrance as Cleopatra in a mesmerizing costume designed by Yandy at the BACARDÍ x Kenzo Digital Halloween party in Brooklyn. As she walked through the party, an entourage of fans and photographers engulfed the walkway before she made her way to the second floor VIP with Fashion Designer Jason Wu, who helped her get ready for the evening. Photo: BFA

Lily Aldridge channeled Breakfast at Tiffany's Audrey Hepburn. Photo: Instagram/@lilyaldridge

Beyonce, her mother Tina Lawson and her daughter Blue Ivy pushed it with their Salt-N-Pepa costumes during Angie Beyince's Halloween bash. Photo: Instagram/@beyonce

Frankenstein Mark Ronson was deejaying alongside pal Swizz Beats at the BACARDÍ x Kenzo Digital party at The Brooklyn Navy Yard. Photo: BFA

As if! Kelly Rowland was rolling with the homies dressed as Dionne from Clueless for Angie Beyince's Halloween bash. Photo: kellyrowland

What big eyes you have! Paris Hilton dressed up as Little Red Riding Hood for the Casimigos Tequila Halloween Party. Photo: Instagram/@casamigos

Jessica Seinfeld was a pretty kitty as she posed next to Gwyneth Paltrow during her Inaugural Good+ Foundation Halloween Bash in L.A. Photo: Getty Images

Robin Thicke re-enacted iconic film Pretty Woman with his girlfriend April Love Geary for the Casamigos Tequila Party. Photo: Instagram/@casamigos

Matthew Morrison and Renee Puente looked every bit the part in their The Joker and Harley Quinn costumes at his 7th Annual Halloween-Birthday bash presented by Freixenet Cava and Podwall Entertainment at Hyde Los Angeles. Photo: Splash

Olympic British Gold Medalist Chris Mears and Spencer Lift showed off their fit bods during Matthew Morrison's 7th Annual Halloween-Birthday bash presented by Freixenet Cava and Podwall Entertainment at Hyde Los Angeles. Photo Splash

Kylie Jenner got dirrty as 2002-era Christina Aguilera. Photo: Instagram/@kyliejenner

Jenna Dewan Tatum turned herself into a unicorn for the Casamigos party. Photo: Instagram/@jennaldewan

If you say"Beetlejuice", Victoria Justice will appear! Instagram/@victoriajustice

Jacob Tremblay does his best Marty McFly – and we're impressed! Instagram/@jacobtremblay

Amy Schumer and boyfriend Ben Hanisch nailed their Eleven and Dustin Stranger Things costumes. Photo: Instagram/@amyschumer

Smile! Emma Roberts is unrecognizable with her skull makeup. Photo: Instagram/@emmaroberts

Cindy Crawford captioned this mirror selfie – starring left to right, son Presley, daughter Kaia and husband Rande – 'Punk family portrait' ahead of the Casamigos party. Photo: Instagram/@cindycrawford

Katy Perry shows she's definitely 'with her' thanks to her jaw-droppingly accurate Hillary Clinton costume. The singer, who got ready sipping a SVEDKA cocktail, went as the presidential candidate as her boyfriend Orlando Bloom went as a troll version of Donald Trump. Photo: Instagram/@katyperry

Party hostess Kate Hudson got in touch with her inner cowgirl along with Jonas Tahlin, CEO of Absolut Elyx at her house party in L.A. Photo: Instagram/@katehudson

Jessica Alba and pal Kelly Sawyer were ready to party as AbFab divas Patsy and Edina. Photo: Instagram/@jessicaalba

She's not bad, she's just drawn that way – just ask Jessica Rabbit, a.k.a. Alessandra Ambrosio. Photo: @alessandraambrosio

Mariah Carey dressed as a devil for her pre-Halloween celebrations. Photo: Instagram/@mariahcarey

The singer was joined by her ex-husband Nick Cannon for the party along with their adorable twins Moroccan and Monroe. Photo: Instagram/@mariahcarey Photo: © Instagram