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.

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Yay, I can't wait for the sibling reunion!!

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I am actually excited for this crossover. Finally, we'll learn more about Derek, which is great by me.

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I hope Derek and Amelia make peace. @brittany
Addison is not in this Crossover, it just Amelia.

Merderistruelove

I am looking foward to know more about Derek! I wonder how she's gonna behave towards Mer...

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I'm so excited!

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I'm excited to see this episode, I think it'll be good. I love Caterina in PP, I think she'll bring new depth to Grey's for however long the crossover is(:

Grey's Anatomy Quotes

Just because we can live without something, it doesn't mean we have to.

Meredith

Derek: I am calling post-it, Zola, Bailey, the tumors on the wall, ferryboat scrub caps. I thought D.C. was everything. I was wrong. You... you're everything. I love you and I'm not going to stop loving you. I can't live without you. I don't want to live without you, and I'm going to do everything in my power to prove it.
Meredith: I can live without you, but I don't want to. I don't ever want to.