Demi Lovato Previews Tonight's Grey's Anatomy

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Tonight's Grey's Anatomy guest star, Demi Lovato, spoke with E! Online about what it was like to meet the cast, what a big fan she is of the show, and much more.

Demi plays an extremely troubled patient Alex must treat on "Shiny Happy People." Below are some excerpts from the 17-year-old Disney star's conversation ...

On making her boyfriend, Joe Jonas, tune in: "I don't think [Joe] has ever watched it but I'm gonna make him ... I'm gonna show him how amazing it is."

On what she said upon meeting some cast members: "Um, hi! Can I just say hi? I'm just ... a really big fan. I just saw Owen, and got really starstruck!"

"I'm a huge fan. Obsessed ... it not healthy. People know on my set (Sonny with a Chance), ‘OK, she's gotta be home at 8:45 so she can watch [Grey's] at 9.'"

Scanning Both Sides of the Brain

On her role: "I'm playing a possible schizophrenic, and I hear every sound in my body from my heart beating to my eyes moving, to my muscles flexing, to my blood rushing. I hear everything going on in my body and I couldn't take it and I try to claw my eyes out."

On her makeup for the part: "It's a little Lady Gaga-esque ... I've been doing a lot of crying so it's probably worn off by now, but it's pretty awesome."

On her experience on the set: "Everyone has been super sweet to me and really welcoming. At like 6:00 on a Monday morning, I walk in and Patrick Dempsey's like, ‘Hello there, Demi…How do you say your name?' And I was just like, ‘Oh! There's Patrick Dempsey!'"

"There was a huge smile that came on my face then. My favorite is, don't tell, but I love Lexie! Lexie's like my character and I love her character so much."

Justin Chambers and Kevin McKidd also chimed in on their characters ...

Justin on Alex's relationship with Lexie: "It's a little physical. It's kind of a rebound. Alex married Izzie and said all those wonderful things and I don't think you just fall out of relationship that easy. But [Lexie is] a cute girl. Asweet girl. So maybe there's something there."

Kevin on Owen, Mark and fighting for Teddy: "They could throw down, the two of them. I'd like to see who comes out on top! [Laughs] Not in that way. But we haven't had a good fight scene since Derek and Sloan at the end of last season, so that would be fun."

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.

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Grey's Anatomy Quotes

[narrating] "At the end of the day, when it comes down to it, all we really want is to be close to somebody. So this thing where we all keep our distance and pretend not to care about each other, it's usually a load of bull. So we pick and choose who we want to remain close to, and once we've chosen those people, we tend to stick close by. No matter how much we hurt them. The people that are still with you at the end of the day, those are the ones worth keeping. And sure, sometimes close can be too close. But sometimes, that invasion of personal space, it can be exactly what you need."

MEREDITH

Did you say it? 'I love you. I don't ever want to live without you. You changed my life.' Did you say it? Make a plan. Set a goal. Work toward it, but every now and then, look around; Drink it in 'cause this is it. It might all be gone tomorrow."

Meredith (closing voiceover)