'Grey's Anatomy' And 'Private Practice' Plan New Crossover

Crossover Alert!

"Grey's Anatomy" and "Private Practice" are doing another crossover episode, TVGuide.com has learned exclusively.

Following the "If/Then" episode of "Grey's" -- in which Kate Walsh will appear in an alternate reality that sees Ellis Grey (Kate Burton) alive and Addison and Derek (Patrick Dempsey) still married -- Caterina Scorsone's Amelia will head to Seattle Grace for an episode slated for mid-February. Details are scarce, but both Derek and Lexie (Chyler Leigh) will also appear in the "Private Practice" hour of the crossover.

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