Demi Lovato on Grey's Anatomy -- FIRST LOOK!

Demi Lovato‘s face is full of cuts and scratches in this new still from her guest appearance on Grey’s Anatomy, courtesy of TV Guide Magazine.

The 17-year-old actress plays a frightened patient named Hayley, who might suffer from schizophrenia.

Demi dished to TV Guide, “The first two actors I met were Justin Chambers and Jessica Capshaw, and I was like, ‘There’s Karev and Arizona!’ Then I met Patrick Dempsey.”

You can catch Demi on Grey’s on Thursday, May 13th!

Also, Mandy Moore will be guest starring on the season finale. More details on JJ!