There were tons of celebrities out and about in their hottest, creepiest, most adorable costumes last Halloween. Ahead of this year's spooky holiday, we're looking back at some of the best costumes seen at Heidi Klum's star-studded bash, Maroon 5's big event, and Adam Lambert's party — not to mention all the must-see Halloween costumes on Instagram. Read through to see stars dressed as everything from rock stars to superheroes, and if you can't get enough of the costume madness, check out the 27 times celebrities channeled other celebrities for Halloween!
Look Back at All of Last Year's Memorable Celebrity Halloween Costumes!
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