Halloween isn't just about trick-or-treating and getting your kids' costumes! Grownups celebrate too … and in Hollywood, stars step out in style to mark the ghoulish holiday at exclusive soirees, nightclub bashes, and charity events from New York to L.A.. Check out some of the haunted happenings stars will surely be showing up to this year, and even some parties you can attend … for a price.

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Heidi Klum buddied up with DJ QuestLove at her big party last year. (Chris Weeks/WireImage)Heidi Klum's 13^th Annual Halloween Party, Wednesday, October 31: It's one of the most buzzed-about Halloween soirees in the celeb world — Heidi Klum's see-and-be-seen (in costume) big Halloween bash. Every year, the "Project Runway" arrives in elaborate costume (last year, she was a skinless human body, a la the popular Bodies in Motion exhibit) and was rolled in on a stretcher by two men in lab coats. This time around, she'll arrive in a Cleopatra costume (and without husband Seal for the first time in years, now that the two are separated). The big soiree is set to take place on Halloween, and mark the opening night of New York City's new Finale club on the Lower East Side. The Roots' DJ QuestLove will be spinning the tunes and guests will sip on spooky elixirs like HobNob's Wicked Red Punch, made of red wine, rum, and OJ. Last year Klum threw two bashes — one in Las Vegas and one in New York — and guests list included Fergie, John Legend, Russell Simmons, and Kate Upton. This year, however, everyone is wondering if one particular guest will be there: Klum's new boyfriend, bodyguard Martin Kristen.