Mandy Moore to Guest Star on Grey's Anatomy Season Finale

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Grey's Anatomy's upcoming Season 6 finale will feature a famous face: Mandy Moore.

The 25-year-old singer-actress will play Mary, a patient being treated by Bailey (Chandra Wilson) in the show's much-anticipated May 20, game-changing finale.

Sources said Moore is just one part of the kind of finale that executive producer Shonda Rhimes loves keeping under wraps, so no further details are available yet.

Any theories are welcome below!

Mandy Moore Picture

Are you excited to see Mandy Moore on Grey's Anatomy?

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

Meredith: You're me.
Amelia: What?
Meredith: You're me before Derek. I can be here for you. I can do this. I get you. I can be a twisted sister for you. Just tell me how do you want to play this?

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)