The Bella Twins guest star on USA Network's 'Psych': photos | WWE

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The Bella Twins guest star on USA Network's "Psych" March 19 at 9/8 CT.

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Brie and Nikki show their scary sides as zombie vampires in the "A Nightmare on State Street" episode.

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"Psych" is celebrating its final season on USA Network.

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Former Raw guest star James Roday plays Shawn Spencer on "Psych."

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Roday also guest directs the "Psych" episode featuring The Bellas.

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Dule Hill plays Gus Guster on "Psych."

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For more on "Psych" and to watch full episodes, visit usanetwork.com/psych.