Gerard Butler
The actor (and a mystery gal-pal) party at the Treats! magazine bash presented by Utsinger Entertainment in L.A.
Sarah Hyland
The Modern Family star charms a snake at No Vacancy during the Just Jared Halloween party.
Josh Henderson
Not sure we can stomach the Dallas star's womanly looks at the Just Jared party.
Beyoncé
Queen Bey appears as Mexican artist Frida Kahlo on Halloween in New York City.
Paula Abdul
The former American Idol judge puts her fears to the test at Knott's Scary Farm in Buena Park, Calif.
Zoë Kravitz
The actress-singer finds religion on the Freixenet float at the Village Halloween Parade in New York City.
Chloe & Grayson Chrisley
The Chrisley Knows Best stars put their super powers to good use on Halloween.
Derek Hough
Derek, REMEMBER WHO YOU ARE.
Adam Lambert
The American Idol alum, guest Queen vocalist and glam rocker appears at his second annual Halloween bash at Bootsy Bellows in West Hollywood, California.
Adam Levine & Behati Prinsloo
The gorgeous couple dress as '80s icons during his 10th annual bash, where guests sipped Dos Equis.
Patrick Schwartzenegger
The political scion wigs out as Will Ferrell in Semi-Pro at the Just Jared party at No Vacancy.
Adele
The notoriously private singer appears at Jonathan Ross's annual Halloween Party in London.
Ben McKenzie
The Gotham star attends Heidi Klum's 15th annual Halloween Party, presented by Moto X and sponsored by SVEDKA Vodka, at TAO Downtown in New York City.
Rihanna
Rihanna and her friends are Sexy Ninja Turtles!
Chloe Grace Moretz
The actress gets a really big scare at Netherworld Haunted House in Atlanta.
Coco Austin & Ice-T
The adorable duo attends Heidi Klum's 15th annual Halloween Party, presented by Moto X and sponsored by SVEDKA Vodka, at TAO Downtown in New York City.
Zoë Kravitz & Whoopi Goldberg
The two appear on the Freixenet Float at the Village Halloween Parade in New York City.
Lady Gaga
BOO!
Heidi Klum
The Queen of Halloween underwent quite the metamorphosis.
Ashanti
The R&B singer is seen at Heidi Klum's 15th annual Halloween Party, presented by Moto X and sponsored by SVEDKA Vodka, at TAO Downtown in New York City on Oct. 31, 2014.
Michelle Trachtenberg
The Buffy the Vampire Slayer and Gossip Girl alum is seen at Heidi Klum's 15th annual Halloween Party, presented by Moto X and sponsored by SVEDKA Vodka, at TAO Downtown in New York City on Oct. 31, 2014.
Joe Jonas
The singer is seen at Heidi Klum's 15th annual Halloween Party, presented by Moto X and sponsored by SVEDKA Vodka, at TAO Downtown in New York City on Oct. 31, 2014. His rival, not pictured, is so hot right now.
Kelly Ripa, Michael Strahan & Alicia Quarles
Live With Kelly and Michael gets in the holiday spirit with the E! News star.
Rita Ora & Kate Moss
The British beauties kick it as Paris Hilton and Cara Delevingne (in a Rotten Roach T-shirt) at the "Death of a Geisha" party in London.