When Amelia Met Derek: Caterina Scorsone Reveals Grey's Anatomy-Private Practice Crossover Details

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Grey's Anatomy. Private Practice. The worlds cross over again October 7.

At the center of this latest Shonda Rhimes-created event? Caterina Scorsone, who plays Amelia Shepherd, sister of Derek. She says we can blame Addison for this one.

No, really.

Shepherd Squabble

"Basically Addison kicks her in the keester," the actress tells E! Online of the siblings' awkward reunion. "Amelia has been kicking and screaming and doing everything she can do to avoid the inevitable, but Addison somehow convinces her that she's gotta go to Seattle."

"[Derek and Amelia] have been at an impasse for years after their father's tragedy," Caterina Scorsone says. "She has some pretty bad behavior and Derek's got his quirks. I'm not going to give Amelia all the blame, but there's some cathartic movement in that relationship."

In addition to bringing Grey's Anatomy and Private Practice characters together again, this should offer some new insight into the mind of the former's leading man.

"You find out a lot about Derek," Scorsone promises. "That's one of the things that'll be interesting for a lot of people who have been watching the show for years, myself included. You really get to find out about that tragedy that's colored both of our lives ever since."

"We were young when we witnessed our father's murder, and so fans really get to learn about that. Amelia is pretty focused on Derek and trying to mend that relationship," the actress continues. "And I'm really happy with how it all went."

We can't wait. Both shows premiere Thursday at 9 and 10 p.m., respectively.

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 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."

There's a reason I said I'd be happy alone. It wasn't 'cause I thought I'd be happy alone. It was because I thought if I loved someone and then it fell apart, I might not make it. It's easier to be alone, because what if you learn that you need love and you don't have it? What if you like it and lean on it? What if you shape your life around it and then it falls apart? Can you even survive that kind of pain? Losing love is like organ damage. It's like dying. The only difference is death ends. This? It could go on forever.

Meredith