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, at least if the guest list is any indication.

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