Celebrities in Halloween Costumes Pictures

See All the Celeb Halloween Costume Pictures From Twitter!

See All the Celeb Halloween Costume Pictures From Twitter!

Happy Halloween! The main event happened yesterday, but many stars got a head start on the fun over the weekend. We've seen lots of celebrity Halloween costumes from various parties and events, and the A-listers were also happy to share some of their own snaps online. We've collected photos from Brooklyn Decker, Nina Dobrev, Zac Efron, Jessica Alba, and many more — click through to see the images shared on Twitter!

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