Socialite Paris Hilton is decked out in a heroine outfit as she leaves a Halloween party in Los Angeles
MAB / Splash News
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Belle of the ball: Gwen Stefani is dressed up as a Princess for Halloween costume party at Beverly Wilshire Hotel in Los Angeles.
MAB / Splash News
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Actress Debra Messing and hejr husband David Zelman get ghoulish for Bette Midler's Hulaween event in New York City.
Nancy Rivera / Splash News
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Me-oww! Nicky Hilton dresses as a leopard for a Halloween party in Los Angeles.
MAB / Splash News
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Meanwhile, the rest of Hollywood had work to do: Christian Bale cracks a smile on the set the new Batman flick "The Dark Knight Rises" on 5th Avenue in New York City.
Darla Khazei, PacificCoastNews.com
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Leighton Meester films scenes for "Gossip Girl" on the Upper East Side in New York City.
Darla Khazei, PacificCoastNews.c
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Kate Moss leaving Royal Albert Hall After Attending a George Michael performance in London.
Rotello/MCP/startraksphoto.com
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Uma Thurman arrives at the Golden Heart Awards at Skylight in New York City's SoHo neighborhood.
Guapo / Splash News
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What a party animal! Nicole "Snooki" Polizzi shows her wild side while hosting at Pure night club inside the Caesars Hotel in Las Vegas.
Splash News
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He might bite: Rapper and actor Ice-T and wife Coco host the "Player's Ball" Halloween party at LAX Nightclub inside the Luxor Hotel & Casino in Las Vegas.
Don MacCarthy/London Ent/Splash
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She's earned it: "Halloween" star Jamie Lee Curtis leaves the scary stuff behind with a Little Red Riding Hood outfit at 18th Annual Dream Halloween benefitting the Children Affected by AIDS Foundation in Santa Monica, Calif.
Jen Lowery / Splash News
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"That 70s Show" actor Topher Grace arrives at Kate Hudson's Halloween costume party in Pacific Palisades, Calif.
RFC/bauergriffinonline.com
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Musicians and sisters Amanda and Alyson Michalka strut their stuff at Kate Hudson's Halloween costume party.
RFC/bauergriffinonline.com
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What a couple of stiffs! Alex McCord and Simon McCord at Top of the Rock's 620 Loft & Garden in New York City.