Gallery: It's Alive! Nick & Vanessa Scare Us

See which stars are too ghoul for school and whose costumes are scary-bad

Back-from-the-dead couple Nick Lachey and Vanessa Minnillo threw a private Halloween bash (put together with party planner Marley Majcher), which was monstrously successful. At least if the guest list is any indication.

Joining Mr. and Mrs. Stein (see above) at their bash were Kate Beckinsale, Tommy Lee, Stacy Keibler, Kara DioGuardi and Wilmer Valderrama.

Elsewhere in Hollywood, Paris Hilton opened her Beverly Hills home Friday for costumed pals Hayden Panettiere (channeling her inner Jessica Rabbit in tight red dress and red wig), Whitney Port (in a Lady Gaga-like getup), Ryan Seacrest (still wearing the Ponch from CHiPs outfit he wore to work at E! earlier in the day).

At one point Hilton, who was dressed like Dorothy from The Wizard of Oz (as was boyfriend Doug Reinhardt), grabbed the microphone and announced to partygoers, "This is the sickest Halloween party in the world, I love you guys!"