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

It's harder to love somebody than to walk away from them.

Amelia

MEREDITH: "You don't get to call me a whore. When I met you, I thought I had found the person that I was going to spend the rest of my life with. I was done! All the boys and all the bars and all the obvious daddy issues, who cares? I was done. You left me. You chose Addison. I'm all glued back together now. I make no apologies for how I chose to repair what you broke. You don't get to call me a whore."
DEREK: "This thing with us is finished. It's over."
MEREDITH: "Finally."
DEREK: "Yeah, it's done."
MEREDITH: "It is done."