(InStyle) -- Need some Halloween costume inspiration? See how your favorite celebrities celebrate the most frightful night of the year: . Kim Kardashian . "Poisonous!!!" the reality star Tweeted of her Poison Ivy outfit. Stacy Keibler . With jewelry by Graziela and Dana Rebecca Designs, Keibler looked boo-tiful as the host of a Halloween masquerade at the Hyde Bellagio in Las Vegas. Christina Aguilera . Christina Aguilera toted boyfriend Matthew Rutler as the knight to her queen for their festivities in Los Angeles. Alyson Hannigan . The actress played the role of a scarecrow, while daughter Satyana dressed as a pumpkin. Halloween 2012: Best celebrity-inspired halloween costumes . AnnaLynne McCord . The actress channeled the Victorian era to host the Haunted Seduction Halloween party held at Pure Nightclub in Las Vegas. Michelle Trachtenberg . The actress brought Tim Burton's "Blue Girl With Wine" piece of artwork to life in New York. Halloween 2012: Cupcakes from the bakeries stars love . Fergie . With teddy bear, trophy, sash, and tiara in hand, the singer played the perfect toddler beauty queen at Heidi Klum's Halloween bash at PH-D at Dream Downtown in New York. Dita Von Teese . The burlesque star pulled a piece out of her closet for Maroon 5's Hollywood Halloween. "Last minute decision to go out for Halloween...Scraping through my wardrobe for something that resembles a costume. No problem!" she Tweeted of her emergency costume. Leona Lewis . The singer represented a tragic pageant queen, sash and all. Lauren Conrad . The reality-star-turned-fashion-designer reworked a cute red and white polka dot dress into a Minnie Mouse costume. Miranda Kerr . The Victoria's Secret Angel stepped into the ring at Catch Rooftop in New York City to host a bash as a circus ringmaster. See 51 more celebrities in Halloween costumes! Get a FREE TRIAL issue of InStyle - CLICK HERE! Copyright © 2011 Time Inc. All rights reserved.
AnnaLynne McCord channeled the Victorian era to host a Halloween party in Las Vegas .
Michelle Trachtenberg brought Tim Burton's "Blue Girl With Wine" artwork to life .
Christina Aguilera played a pirate at Maroon 5's Hollywood bash .
(InStyle) -- Need some Halloween costume inspiration? See how your favorite celebrities celebrate the most frightful night of the year: . Kim Kardashian . "Poisonous!!!" the reality star Tweeted of her Poison Ivy outfit. Stacy Keibler . With jewelry by Graziela and Dana Rebecca Designs, Keibler looked boo-tiful as the host of a Halloween masquerade at the Hyde Bellagio in Las Vegas. Christina Aguilera . Christina Aguilera toted boyfriend Matthew Rutler as the knight to her queen for their festivities in Los Angeles. Alyson Hannigan . The actress played the role of a scarecrow, while daughter Satyana dressed as a pumpkin. Halloween 2012: Best celebrity-inspired halloween costumes . AnnaLynne McCord . The actress channeled the Victorian era to host the Haunted Seduction Halloween party held at Pure Nightclub in Las Vegas. Michelle Trachtenberg . The actress brought Tim Burton's "Blue Girl With Wine" piece of artwork to life in New York. Halloween 2012: Cupcakes from the bakeries stars love . Fergie . With teddy bear, trophy, sash, and tiara in hand, the singer played the perfect toddler beauty queen at Heidi Klum's Halloween bash at PH-D at Dream Downtown in New York. Dita Von Teese . The burlesque star pulled a piece out of her closet for Maroon 5's Hollywood Halloween. "Last minute decision to go out for Halloween...Scraping through my wardrobe for something that resembles a costume. No problem!" she Tweeted of her emergency costume. Leona Lewis . The singer represented a tragic pageant queen, sash and all. Lauren Conrad . The reality-star-turned-fashion-designer reworked a cute red and white polka dot dress into a Minnie Mouse costume. Miranda Kerr . The Victoria's Secret Angel stepped into the ring at Catch Rooftop in New York City to host a bash as a circus ringmaster. See 51 more celebrities in Halloween costumes! Get a FREE TRIAL issue of InStyle - CLICK HERE! Copyright © 2011 Time Inc. All rights reserved.
Las Vegas. Christina Aguilera . Christina McCord . The actress channeled the Victorian era to host the Haunted Seduction Halloween party held at Pure Nightclub in Las Vegas. Michelle Trachtenberg . The actress brought Tim Burton's "Blue Girl With Wine" piece of artwork to life in