Demi Lovato On Set Of “Grey’s Anatomy”

Why does Demi Lovato look like she’s just been admitted to the ER? Don’t worry, it’s all part of her latest TV role.

The star of Disney’s Sonny with a Chance is heading to Seattle Grace for a cameo on ABC’s Grey’s Anatomy later this season.

On Wednesday, Demi TwitPic’d a dramatic image of what looks to be scratches on her face and an IV in her arm on the set of the Emmy-winning medical drama.

“Demi Interrupted. (from ‘Grey’s Anatomy’),” read the caption scrawled beneath the photo.

Lovato — who is dating her Camp Rock co-star Joe Jonas — will play a patient who is treated by Dr. Alex Karev (Justin Chambers). It’s still unclear when Demi’s episode will air on the show, but it’s shaping up to be a season of stars on Grey’s: Last week, ABC announced that singer/actress Mandy Moore will guest star on next month’s season finale.