WEST HOLLYWOOD, CA - OCTOBER 31: Singer/actress Demi Lovato attends her Halloween Party at the PhilyMack Management Building on October 31, 2013 in West Hollywood, California. (Photo by Christopher Polk/Getty Images for Philymack) (2013 Getty Images)
Naya Rivera and husband Ryan Dorsey dressed up as a mail-order bride and the mail delivery guy for Halloween 2014. (Naya Rivera Dorsey via Instagram)
Actor Rico Rodriguez attends Hub Network's First Annual Halloween Bash in Barker Hangar at the Santa Monica Airport on October 20, 2013 in Santa Monica, California. (Getty )
Nicole 'Snooki' Polizzi attends the Snooki and JWoww Halloween Event: 'Night Of The Living Drag' at Providence on October 25, 2013 in New York City. (Getty)
NEW YORK, NY - OCTOBER 31: Fergie 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 Jemal Countess/Getty Images) (2011 Getty Images)
Singer Mayra Veronica attends EBMRF & Sony PlayStation's Epic Halloween Bash hosted by James Marsden and Courteney Cox on October 27, 2012 in Los Angeles, California. (Getty)
Naya Rivera. (Instagram)
Singer Christina Milian arrives at the Hpnotiq Halloween Party at Les Deux on October 30, 2007 in Los Angeles, California. (Getty)
NEW YORK, NY - OCTOBER 25: Nicole 'Snooki' Polizzi and Jennifer 'JWoww' Farley attend the Snooki and JWoww Halloween Event: "Night Of The Living Drag" at Providence on October 25, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images) (2013 Getty Images)
Victor Lona 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. (Getty)
Paulina Rubio performs on stage at the 2002 West Hollywood Halloween Parade Featuring Pink October 31, 2002 in West Hollywood, California.
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Singer Mariah Carey and her husband actor-TV personality Nick Cannon attend a Halloween celebration at M2 Ultra Lounge on October 31, 2009 in New York City. (Getty )
Grammy-award winning singer and songwriter Gloria Estefan encountered deceased souls while making her way through the Winter's Night: The Haunting of Hawthorn Cemetery haunted house at Universal Orlando Resort's Halloween Horror Nights 21 on October 1, 2011 in Orlando, Fla. (Getty )
Cassie attends the Lucky Strike Lanes Halloween night Masquerade at Lucky Strike Lanes on October 31, 2008 in New York City. (Getty )
Fashion designer and winner of season 4 Project Runway Christian Siriano attends Heidi Klum's 9th annual Halloween party presented by Absolut 100 at 1 OAK on October 31, 2008 in New York City. (Getty )
Actress Eva La Rue arrives at the Children Affected By AIDS Foundation's 17th Annual Dream Halloween event at Barker Hanger on October 30, 2010 in Santa Monica, California. (Getty )
MTV VJ La La on stage during a special Halloween edition of MTV's Total Request Live at the MTV Times Square Studios October 31, 2003 in New York City. (Getty )
Perez Hilton arrives at the Heidi Klum's 10th Annual Halloween Party on October 31, 2009 in Los Angeles, Calif. (Getty )
Miss Universe Ximena Navarrete attends Heidi Klum's 2010 Halloween Party at Lavo on October 31, 2010 in New York City. (Getty)
Vida Guerra poses at the Halloween Mansion Party hosted by Haylie Duff on October 31, 2005 in Hollywood, Los Angeles, California. (Getty )
Actor Jordi Caballero attends a Halloween party to celebrate the Lionsgate Premiere of 'Saw III' on October 31, 2006 in Los Angeles. (Getty)
Actress Michelle Rodriguez attends the Shane Black 9th annual Hallowen party held on October 31, 2003 in Hancock Park, Los Angeles. (Getty )
Spanish model Juncal Rivero attends the Veuve Cliquot Halloween Party October 31, 2001 in Madrid, Spain. (Getty)
Actor Laz Alonzo poses at the Halloween Mansion Party hosted by Haylie Duff on October 31, 2005 in Hollywood, Los Angeles, California. (Getty )
Model María Ines Rivero arrives at Heidi Klum's Annual Halloween party at Happy Valley October 31, 2005 in New York City. (Getty )
Actor Wilmer Valderrama attends "Ian Schrager's Mondrian Hotel Throws A Halloween Party...70's Style," hosted by stars of "That 70's Show" at The Mondrian Hotel on October 31, 2002 in West Hollywood, California. (Getty )
Alisa Reyes poses at the Halloween Mansion Party hosted by Haylie Duff on October 31, 2005 in Hollywood, Los Angeles, California. (Getty)
Pop Star Mariah Carey arrives at her private Halloween party at The Collection October 31, 2003 in London, England. (Getty)
Carlos Ramirez poses at the Halloween Mansion Party hosted by Haylie Duff on October 31, 2005 in Hollywood, Los Angeles, California. (Getty )
Miss Spain 2000, Helen Lindes, attends the Veuve Cliquot Halloween Party October 31, 2001 in Madrid, Spain. (Getty)
Actor David Lago poses as Elvis at the Halloween Mansion Party hosted by Haylie Duff on October 31, 2005 in Hollywood, Los Angeles, California. (Getty )