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  • Heidi Klum Dresses As Jessica Rabbit

    Heidi Klum Dresses As Jessica Rabbit
    Heidi Klum attends her Halloween Party on Oct. 31, 2015 in New York City.
    Andrew Toth/Getty Images
  • Casper Smart and Jennifer Lopez

    Casper Smart and Jennifer Lopez
    Casper Smart and Jennifer Lopez attend Heidi Klum's 16th Annual Halloween Party sponsored by GSN's Hellevator And SVEDKA Vodka At LAVO New York on Oct. 31, 2015 in New York City.
    Mike Coppola/Getty Images
  • Cindy Crawford and Rande Gerber

    Cindy Crawford and Rande Gerber
    Cindy Crawford and Rande Gerber arrive at the Casamigos Tequila Halloween Party on Oct. 30, 2015 in Los Angeles, Calif.
    Jesse Grant/Getty Images
  • Fergie and Josh Duhamel

    Fergie and Josh Duhamel
    Fergie and Josh Duhamel are seen celebrating Halloween in Beverly Hills on Oct. 30, 2015 in Los Angeles, Calif.
    AaronP/GC Images/Getty Images
  • Nicki Minaj

    Nicki Minaj
    Recording artist Nicki Minaj attends a Haunted Funhouse Halloween party at 1 OAK Nightclub at The Mirage Hotel & Casino on Oct. 31, 2015 in Las Vegas, Nevada.
    Steven Lawton/Getty Images
  • David Spade

    David Spade
    David Spade arrives at the Casamigos Tequila Halloween Party on Oct. 30, 2015 in Los Angeles, Calif.
    Jesse Grant/Getty Images
  • John Stamos and Josh Peck

    John Stamos and Josh Peck
    John Stamos and Josh Peck attend Carlton's Halloween Nightmare! on Oct. 24, 2015 in Beverly Hills, Calif.
    Michael Bezjian/Getty Images
  • Ellen DeGeneres Dresses as a Kardashian

    Ellen DeGeneres Dresses as a Kardashian
    The Ellen Show posted this photo to Instagram on Oct. 29 with the caption, "Don't miss my Halloween show tomorrow! Love, Karla Kardashian."
    ellenshow/Instagram
  • Nick Jonas

    Nick Jonas
    Nick Jonas attends the Maxim Halloween Party Presented By Karma International, Oct. 24, 2015, in Los Angeles.
    Todd Williamson/Getty Images
  • Colton Haynes

    Colton Haynes
    Colton Haynes shared this image to his Instagram dressed as Ursula from "The Little Mermaid."
    Colton Haynes/Instagram
  • Niecy Nash

    Niecy Nash
    Niecy Nash arrives at the 2015 MAXIM Magazine's official Halloween Party held, Oct. 24, 2015, in Beverly Hills, Calif.
    Michael Tran/FilmMagic/Getty Images
  • Aubrey O'Day

    Aubrey O'Day
    Aubrey O'Day arrives at the 2015 MAXIM Magazine's official Halloween Party held, Oct. 24, 2015, in Beverly Hills, Calif.
    Michael Tran/FilmMagic/Getty Images
  • Peta Murgatroyd & Maksim Chmerkovskiy

    Peta Murgatroyd & Maksim Chmerkovskiy
    Peta Murgatroyd, right, and Maksim Chmerkovskiy arrive at the 2015 MAXIM Magazine's official Halloween Party held, Oct. 24, 2015, in Beverly Hills, Calif.
    Michael Tran/FilmMagic/Getty Images
  • AnnaLynne McCord

    AnnaLynne McCord
    AnnaLynne McCord hosts Carlton's Halloween Nightmare!, Oct. 24, 2015, in Beverly Hills, Calif.
    Michael Bezjian/Getty Images
  • Bai Ling

    Bai Ling
    Bai Ling as The Joker, attends the Halloween Hotness 2.0 Costume Party to benefit The National Breast Cancer Foundation held at the Hollywood Roosevelt Hotel, Oct. 17, 2015, in Hollywood, Calif.
    Albert L. Ortega/Getty Images
  • Heidi Klum

    Heidi Klum
    Heidi Klum attends Moto X presents Heidi Klum's 15th Annual Halloween Party sponsored by SVEDKA Vodka at TAO Downtown, Oct. 31, 2014, in New York City.
    Ilya S. Savenok/Getty Images
  • Miley Cyrus

    Miley Cyrus
    Miley Cyrus shared this image to her Twitter dressed as Lil' Kim for Halloween.
    Miley Cyrus/Twitter
  • Katie Perry

    Katie Perry
    Katie Perry is seen at Kate Hudson's annual Halloween party, Oct. 30, 2014, in Los Angeles.
    GC Images/Getty Images
  • Adam Lambert

    Adam Lambert
    Adam Lambert arrives at Adam Lambert's 2nd Annual Halloween Bash at Bootsy Bellows, Oct. 31, 2014, in West Hollywood, Calif.
    Lilly Lawrence/WireImage/Getty Images