By Antoinette Bueno
6:08 PM PDT, November 1, 2012
Lady Gaga proudly showed off a more svelte figure in a barely-there weed costume. She captioned the post, "Happy Highlaween!!"
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Weed Whacker
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Lady Gaga proudly showed off a more svelte figure in a barely-there weed costume. She captioned the post, "Happy Highlaween!!"
Monkeying Around
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Jessica Simpson's daughter Maxwell Drew had a costume change, switching from a chicken to a monkey.
Jennifer Lopez & Casper Smart
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jenniferlopez.com
Hippie love! Jennifer Lopez linked arms with her super-toned boyfriend Casper Smart.
Katy Perry & Shannon Woodward
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BFFs Katy Perry and Shannon Woodward paid homage to the MTV classic Daria.
Vanessa Hudgens
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Vanessa Hudgens and her sister Stella owned the night as sexy vampires.
A Day Off
The hosts of The Doctors retired their scrubs for the day, dressing as their favorite talk show host counterparts.
Alyson Hannigan
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Splash News
Alyson Hannigan and family made adorable sparkly dragons.
Ashley Tisdale
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Splash News
Is this really a "Batman" costume?
Kate Moss
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Splash News
Kate Moss and husband Jamie Hince went as Morticia and Gomez Addams.
Victoria Justice
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Twitter
Sexy Abraham Lincoln?! … at least it's creative.
Jenny McCarthy
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Splash News
Is she really 40 years old?!
Mariah Carey & Nick Cannon
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Mariah made a gorgeous Goldilocks.
NPH and David Burtka With Twins Gideon and Harper
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Twitter
Neil Patrick Harris and David Burtka play Wizard of Oz with two-year-old twins Gideon and Harper in this adorable pic shared via Twitter.
Maria Shriver
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Instagram
Super-mommy Maria Shriver was snapped by daughter Katherine Schwarzenegger, cape and all, on Halloween day.
Kal Penn
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Twitter
Clad in stripes and carrying a briefcase, Kal Pen looked ready for business decked out as Disney's beloved Tigger the tiger.
Can You Smell What The Hulk is Cooking?
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Facebook
Dwayne "The Rock" Johnson posted: "Don't make me angry.." "You wouldn't like me when I'm angry" ~ The People's Hulk. Happy Halloween!
Nick Cannon, Mariah Carey & Dem Babies
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Dressed as Goldilocks and the three bears, Maria Carey playfully poses with hubby Nick Cannon and 18-month-old twins Moroccan and Monroe.
'Glee' Dracula
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Instagram
Adam Shankman posted from the set of Glee: "Having a snack on, I mean, WITH @diannaagron"
You Better 'Pink'-neckognize
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Paris Hilton posted: "How do you like my Honey Boo Boo #Halloween costume?"
Kim Kardashian & Kanye West
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Splash News
Kim Kardashian's mermaid get-up included a $2,000 blonde wig ... wonder how much Kanye West's sailor suit costs?
Jessica Simpson & Eric Johnson
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lifestyle.jessicasimpson.com
A super-slim Jessica Simpson and family got into the Halloween spirit.
Fergie & Josh Duhamel
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Instagram
Fergie showed off her crazy figure as Angelyne next to an unrecognizable Josh Duhamel as Dennis Woodruff.
Patrick Schwarzenegger & AJ Michalka
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Instagram
New couple alert? Patrick Schwarzenegger and AJ Michalka looked cozy at two separate Halloween parties.
Stacy Keibler
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Getty Images
Stacy Keibler made a pretty black swan.
Heidi Klum
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Twitter
Though her annual Halloween bash was canceled due to Hurricane Sandy, Heidi Klum took to Twitter to give us all a preview of her glamorous Cleopatra get-up this year.
Julianne Hough & Ryan Seacrest
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Instagram
The couple that dresses together stays together? Ryan Seacrest and girlfriend Julianne Hough made a pretty great Bonnie and Clyde duo.
Christina Aguilera & Matthew Rutler
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Splash News
Not exactly sure what costume Christina Aguilera is going for here (sexy-something for sure), but she certainly found her knight in boyfriend Matthew Rutler.
Lance Bass
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Splash News
Lance Bass made for a surprisingly scary clown.
Neil Patrick Harris
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Playboy
Neil Patrick Harris showed his dark side in this creepy, shirtless costume.
Adam Lambert
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Instagram
Adam Lambert and his boyfriend Sauli Koskinen went with dramatic 'Glampire' costumes.