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Stars Turn Halloween Into A Weekend Event!

Ryan SeacrestParis HiltonIsla FisherNick LacheyVanessa MinnilloKate BeckinsaleMickey Rourke…the stars were all out celebrating Halloween, and they started well before the big night.

PHOTOS:  Celebs Celebrate Halloween

Nick and Vanessa hosted a lavish haunted-mansion theme party for their close friends and family thrown by LA’s The Party Goddess! Marley Majcher. Held at Nick’s Bel Air home, guests at the Fright night party enjoyed Skelanimals decorations and party favors, ate kobe burgers, quesadillas, taquitos, risotto and macaroni & cheese, and danced until the early morning hours to Michael Jackson songs.

“Because Dead Animals Need Love Too”: Skelanimals

Guests included Kate Beckinsale, Tommy Lee, Malin Akerman, Joey McIntyre, Drew Lachey, Trace Ayala, Stacy Keibler, Kara DiGuardi and Wilmer Valderrama, and they all took home their very own Skelanimals.

In the Hollywood Hills, Isla Fisher was caught in costume as she took her daughter by Sacha Baron Cohen to a kid’s Halloween party.

Paris Hilton and boyfriend Doug Reinhardt dressed in matching Dorothy from The Wizard of Oz costumes for her appearance on Jimmy Kimmel Live.

Paris & Doug Took A Glam European Vacation

And Ryan Seacrest put his stalker incident behind him and had a blast at Dole Food heir Justin Murdoch‘s annual Halloween bash at the penthouse in his daddy’s Murdoch Plaza building.

Ryan Seacrest Gets Restraining Order Against Stalker.

The American Idol host was dressed in an Army uniform and had eight girls in sailor outfits escorting him. “Ryan hept having girls sit on his lap and when he moved around the party, they all followed him like sheep. Ryan was also spotting kissing two of the girls,” an eyewitness told RadarOnline.com.

Kat Dennings came as a zombie bride. Russell Simmons was seen sucking face with a much younger date dressed as an Indian princess. Mickey Rourke “freaked out” because beer wasn’t being served, our eyewitness said.  One of the party staff finally went to a neighborhood store and bought some.

Steven Dorff, in a flannel shirt and mask, walked around grabbing girls butts until one of them screamed at him for being a “pervert!” He looked really embarrassed, rolled his eyes and “then lit up something that didn’t smell like a cigarette and smoked the whole thing by himself out on the deck,” said the eyewitness.

Come back to RadarOnline.com tomorrow for more great Hollywood Halloween Photos.