Michael Ausiello
March 02, 2010 AT 12:00 PM EST

Image Credit: Kevin Winter/Getty Images; Dempsey: Bob D’Amico/ABCHow’s this for a twist: Shonda Rhimes is introducing Derek Shepherd’s kid sis, but not on Grey’s Anatomy.


Sources confirm to me exclusively that Caterina Scorsone (Lifetime’s 1-800-Missing) is joining — wait for it — Private Practice in the recurring role of Dr. Amelia Shepherd, one of Derek’s never-before-seen sisters.

I’m told the character — nicknamed “Little Shep,” natch — lands a job at Oceanside Wellness.

Currently, there are no plans for Patrick Dempsey to cross over to PP to hang with his sibling, but a family reunion — most likely right at the start of sweeps — is inevitable.

Thoughts? Surprised by the twist?! I didn’t oversell it, did I?

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