'Grey's Anatomy': Demi Lovato's scary hospital pic

demi-lovato-greys.jpg Demi Lovato will test her dramatic acting chops in an upcoming role on "Grey's Anatomy." At least she looks the part ... scary, Demi!

The "Sonny With a Chance" star tweeted the somewhat disturbing pic -- captioning it "Demi Interrupted" -- out Wednesday (April 14) to promote her guest spot on the ABC medical drama. Lovato will play a patient being treated for possible schizophrenia at Seattle Grace.

Look out for Lovato's episode to air in May.

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