Greg Gayne/FOX

You know it's officially Halloween when TV shows start showing off photos of their castmembers all dressed up in costumes like proud parents. "Look! Here is Sofia Vegara as a pregnant alien!" "Awww, Zooey Deschanel is a zombie! How cute."

From the scintillatingly sexy (looking at you, Pretty Little Liars) to the delightfully dumb (that's you, The Office), we rounded up tons of photos of TV's best Halloween costumes. Have a click through and who knows, you might get some good ideas for your own costumes.

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