Voyeur was on fire with celebrities who showed up for Heidi Klum's 10th Annual Halloween Party. Spotted here are: Kelly Osbourne and Luke Worrall, Rick Fox, Derrick Hough, Maxim, Cisco Adler, Kyle MacLachlan, Brett Ratner, Jessica Lowndes, Cojo (dressed as Khloe K.), Rachel Zoe, Tyrese, Julianne Hough, Steph Jhones, Jordin Sparks, and more!