The actor (and a mystery gal-pal) party at the Treats! magazine bash presented by Utsinger Entertainment in L.A.
The Modern Family star charms a snake at No Vacancy during the Just Jared Halloween party.
Not sure we can stomach the Dallas star's womanly looks at the Just Jared party.
Queen Bey appears as Mexican artist Frida Kahlo on Halloween in New York City.
The former American Idol judge puts her fears to the test at Knott's Scary Farm in Buena Park, Calif.
The actress-singer finds religion on the Freixenet float at the Village Halloween Parade in New York City.
The Chrisley Knows Best stars put their super powers to good use on Halloween.
Derek, REMEMBER WHO YOU ARE.
The American Idol alum, guest Queen vocalist and glam rocker appears at his second annual Halloween bash at Bootsy Bellows in West Hollywood, California.
The gorgeous couple dress as '80s icons during his 10th annual bash, where guests sipped Dos Equis.
The political scion wigs out as Will Ferrell in Semi-Pro at the Just Jared party at No Vacancy.
The notoriously private singer appears at Jonathan Ross's annual Halloween Party in London.
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 and her friends are Sexy Ninja Turtles!
The actress gets a really big scare at Netherworld Haunted House in Atlanta.
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.
The two appear on the Freixenet Float at the Village Halloween Parade in New York City.
BOO!
The Queen of Halloween underwent quite the metamorphosis.
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.
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.
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.
Live With Kelly and Michael gets in the holiday spirit with the E! News star.
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.