Celebrities attend a Halloween costume party at the Hollywood Forever Cemetery on October 31, 2012 in Hollywood, California. Here: Katy Perry. (Photo by FameFlynet)





Jerry Ferrara attending a Halloween party at a private residence in Beverly Hills, CA on October 28, 2011. (Photo by INFphoto.com)





Jessica Lowndes arrives to Heidi Klum's 10th Annual Halloween party held at Voyeur on October 31, 2009 in West Hollywood, California. (Photo by Michael Tran/FilmMagic.com)





Jessica Sutta attends the Just Jared Halloween Party at No Vacancy on October 31, 2015 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images)





Actress Joey King attends Just Jared's 6th Annual Halloween Party on October 27, 2017 in Beverly Hills, California. (Photo by Jerritt Clark/Getty Images for Just Jared)





Kim Kardashian (L) and Jonathan Cheban attend Casamigos Halloween Party on October 27, 2017 in Los Angeles, California. (Photo by Neilson Barnard/Getty Images for Casamigos Tequila)





Paris Hilton proudly shows off her assets in her Halloween costume after leaving a party at the Roosevelt Hotel with her sister Nicky and boyfriend River in Hollywood, California on October 26, 2013. (Photo by FameFlynet)





Kate Upton attends Heidi Klum's 12th annual Halloween party at the PH-D Rooftop Lounge at Dream Downtown on October 31, 2011 in New York City. (Photo by D Dipasupil/FilmMagic)





Kelly Ripa (L) and Michael Strahan attend the “LIVE with Kelly and Michael”: Best Halloween Show Ever at Live with Kelly And Michael Studio on October 31, 2013 in New York City. (Photo by Paul Zimmerman/WireImage)





Kendra Wilkinson attends a Halloween party at PURE Nightclub hosted by Heidi Montag on October 30, 2010 in Las Vegas, Nevada. (Photo by Jesse Grant/WireImage)





Lisa Gastineau, Kim Kardashian and Brittny Gastineau attend Kim Kardashian's Halloween party hosted by PAMA at Stone Rose on October 30, 2008 in Los Angeles, California. (Photo by Jesse Grant/WireImage)





Kim Kardashion attends the Midori Green Halloween costume party at Lavo on October 29, 2011 in New York City. (Photo by Dave Kotinsky/Getty Images)





Lindsay Ellingson attends Moto X presents Heidi Klum's 15th Annual Halloween Party sponsored by SVEDKA Vodka at TAO Downtown on October 31, 2014 in New York City. (Photo by Ilya S. Savenok/Getty Images for Heidi Klum)





(L-R) Leigh-Anne Pinnock, Jesy Nelson, Perrie Edwards and Jade Thirlwall of Little Mix attend the KISS FM Haunted House Party at SSE Arena on October 29, 2015 in London, England. (Photo by Dave J. Hogan/Dave J. Hogan/Getty Images)





Actor Nick Cannon and singer Mariah Carey attend their Halloween Eve Costume Party at Marquee on October 30, 2008 in New York City. (Photo by Stephen Lovekin/WireImage for Syndicate)





Mariah Carey during Mariah Carey Hosts a Halloween Party at Collection in London, United Kingdom on October 31, 2003. (Photo by Tim Whitby/WireImage)





Miranda Kerr hosts the s*xy Circus Halloween Party at Catch Rooftop on October 31, 2011 in New York City. Miranda Kerr Hosts s*xy Circus Halloween Party. (Photo by Jerritt Clark/WireImage.com)





Miranda Kerr hosts the s*xy Circus Halloween Party at Catch Rooftop on October 31, 2011 in New York City. (Photo by Jerritt Clark/WireImage)





Olivia Culpo and Nick Jonas attend the Halloween costume party contest at 1 OAK Nightclub at the Mirage Hotel and Casino on October 31, 2014 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)





Celebrities attending the Playboy Mansion Halloween Party in Beverly Hills, California on October 27th, 2012. Pictured: Paris Hilton, River Viiperi. (Photo by FameFlynet)





Paris Hilton attends the 2017 amfAR Fabulous Fund Fair at Skylight Clarkson Sq on October 28, 2017 in New York City. (Photo by Nicholas Hunt/Getty Images)





Singer Rihanna going to a Halloween party with some friends in New York City, New York on October 31, 2014. She and her friends were all dressed up as the teenage mutant ninja turtles. (Photo by FameFlynet)





Rita Ora (L) and Kate Moss dressed as Cara Delevingne attend “Death Of A Geisha” hosted by Fran Cutler and Cafe KaiZen with Grey Goose on October 31, 2014 in London, England. (Photo by David M. Benett/Getty Images)





Celebrities attending a Halloween party in Beverly Hills, California on October 26, 2012. Celebrities attending a Halloween party in Beverly Hills, California on October 26, 2012. Pictured: Rosie Huntington. (Photo by Whiteley FameFlynet)





90210 starlet, Shenae Grimes, dressed as Monster High's Frankie Stein (R), and boyfriend, Josh Beech, leave for Matthew Morrison's 3rd Annual Halloween Party on October 28, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Mattel)





Actors Austin Nichols and Sophia Bush attend Maroon 5's Halloween Bash presented by Bacardi at Hollywood Forever Cemetery on October 31, 2010 in Hollywood, California. (Photo by Charley Gallay/WireImage)





Suki Waterhouse attends the UNICEF Halloween Ball at One Mayfair on October 30, 2014 in London, England. (Photo by Ben A. Pruchnie/Getty Images)





Television personality Bridget Marquardt, dressed in a costume, attends the Halfway to Halloween Party at the Eve nightclub at Crystals at CityCenter April 24, 2010 in Las Vegas, Nevada. (Photo by David Becker/WireImage)