By Caitlin Donovan
Updated Oct 15, 2010 @ 9:22 am
Credit: Getty; Wireimage; AP photo

Heidi Klum and Martha Stewart (Medusa, above) aren't the only Halloween crazed celebrities. Blake Lively, Kim Kardashian and Mariah Carey have all turned out pretty amazing costumes—and they're just a start. Relive the funniest, spookiest moments from Halloween's past with our star-studded gallery!