Halloween 2008 in Hollywood

The stylish Gwen Stefani chose an egg-cellent get-up when she attended Kate Hudson's pre-Halloween party in West Hollywood. Gavin Rossdale coordinated with his costumed wife, dressing up as a side of bacon.

Martha Stewart

and Blake Lively got into the spirit of the season when the Gossip Girl was a guest star on The Martha Stewart Show in New York City. Stewart went all out as Medusa, while Lively channeled Cleopatra.

Heidi Klum

lived up to her reputation as the queen of Halloween at her annual bash, held at 1Oak in new York City. Klum's husband, Seal went along for the ride to the Absolut 100-sponsored spookfest as Heidi's sinister sidekick.

Though it wasn't clear what he was dressed as, Ed Westwick got cozy with fellow guests at the Soho Grand Hotel's Halloween party in New York City.

Leave it to diva Mariah Carey and husband Nick Cannon to make a wardrobe change in the middle of the costume bash they hosted at New York City's Marquee nightclub. The couple arrived as fire fighters but later swapped get-ups to transform into milk and cookies.

While Lance Bass chose a simple cap and gown for his ensemble, reality TV star Kim Kardashian went all out as Wonder Woman at PAMA's Halloween Masquerade at L.A.'s Stone Rose bar.

It was a storybook Halloween for the folks at the Today show. Meredith Viera (as Pinocchio), Matt Lauer (as Humpty Dumpty), Ann Curry (as Cinderella) and Al Roker (as The Gingerbread Man) showed off costumes inspired by Grimms Brothers Fairy Tales on the Plaza at New York City's Rockefeller Center.

Halloween came early for birthday girl Katy Perry-dressed up as Queen frontman Freddie Mercury-who threw a spooky soiree at L.A.'s Siren Studios to mark her 24th birthday. "I have a cake that's a cadaver and its guts are everywhere. I'm not so sure if anyone's going to have a piece," said Perry, who got her guests into the spirit of the holiday at the Malibu Rum-sponsored bash. "And I arrived in a hearse!"

Movie star mom Jada Pinkett Smith suited up as Super Woman when she accompanied daughter Willow to the Children Affected by AIDS Foundation's 15th annual Dream Halloween benefit in Santa Monica.

Tori Spelling

and husband Dean McDermott joined the bee-list when they took son Liam to a friend's Halloween party in their Los Angeles neighborhood.

Jason Priestley

and family showed their true colors at the Children Affected by AIDS Foundation's Dream Halloween event in Santa Monica. While Jason donned a uniform from the Royal Canadian Mounted Police, wife Naomi Lowde wore a costume that recalled her British roots and daughter Ava did her best Uncle Sam.