Demi Lovato landed a guest role in "Grey's Anatomy"

Demi Lovato is now a patient in Seattle Grace Mercy West Hospital! The Disney star landed a guest role in the hit series "Grey's Anatomy".

Demi tweeted, "For all of you amazing patient people... I'm so thrilled to announce that this week I'm shooting Grey's Anatomy!!!!!!!! :D AHHH!!!!"

She added, "By the way... Mr. Patrick Dempsey himself wants me to give a shoutout to you guys! hahahaha so awesome."

Episode set to air in May, Demi is being treated for schizophrenia by Karev (Justin Chambers) and Arizona (Jessica Capshaw).

Meanwhile, Demi recently made headlines after she admits that she's dating Joe Jonas.

[Photo courtesy by Bauer Griffin]