Jennifer Lopez & Casper Smart
The duo make for some very sexy hippies.
Rupert Sanders & Liberty Ross
K.Stew who? These two put their differences aside to celebrate the Holiday with their kids.
Lauren Conrad
L.C. was practically perfect in every way as Mary Poppins.
Rihanna
This good girl gone bad ruled this Halloween!
Lance Bass, Matthew Morrison & JC Chasez
No strings attached here! With the Glee star dressed up as an old-school Justin Timberlake, these famous friends were thisclose to creating an 'N Sync reunion at Morrison's third annual Halloween party.
Paris Hilton
Better redneckognize! The heiress dressed up as another famous blonde for Halloween: Honey Boo Boo!
Pauly D
The Jersey Shore star celebrates Halloween Vegas-style at the Hard Rock Hotel & Casino dressed as a vampire.
Miley Cyrus
Taking inspiration from a fellow pop star, Miley dresses up as Nicki Minaj.
Hilary Duff
The wholesome mom really switches things up as a Day of the Dead skeleton hottie.
Christina Aguilera & Matthew Rutler
The songstress gets her pink Afro on and her man is a knight in shining armor at a BevHills holiday bash. Sweet!
Vanessa Hudgens
The High School Musical star and her little sister dress up as sexy vampires!
Darren Criss
The Glee guy arrives at costar Matthew Morrison's Halloween party dressed as a boy scout.
Kanye West & Kim Kardashian
The A-listers opt for a nautical look for Midori's Halloween party in New York City.
Shenae Grimes
The 90210 star goes all out for Matthew Morrison's 3rd Annual Halloween Party.
Fergie & Josh Duhamel
Dressed up as legendary Hollywood whodats Angelyne and Dennis Woodruff, the couple really gets into the spirit of things.
Ellen DeGeneres
Sofia Vergara's Emmys dress would not be complete without that wardrobe malfunction but don't worry, Ellen's got that covered!
Matthew Morrison
The actor gives us his best Justin Timberlake while girlfriend Renee Puente makes for a beautiful Britney Spears.
Christina Milian
Kim Kardashian's pal hosts a HPNOTIQ Liqueur bash at Beacher's Madhouse in L.A. dressed as a super sweet cupcake.
Stacy Keibler
George Clooney's girlfriend celebrates Halloween masquerade-style in Las Vegas.
Isla Fisher
Sacha Baron Cohen's other half monkeys around this Halloween.
Emma Roberts
Pretty woman! The actress dresses up as the call girl her aunt made famous in 1990.
Christina Milian
Sexy Queen of Hearts, anyone?
Scott Disick
Kourtney Kardashian's beau looks crazy for a reason! He was hosting an American Psycho-themed Halloween Party at the 1 OAK Nightclub in Las Vegas.
Adam Lambert
The American Idol runner up channels the dark side at Fred & Jason's Halloweenie party.