Kate Walsh (Addison) is back on Grey's Anatomy, but still on Private Practice, of course. She stars on one Shonda Rhimes series after getting her start on the other.
Mark and Addison in a photo from "Blink." A crossover event is totally in effect as Grey's Anatomy finally returns from its hiatus on January 14, 2010.
Not a real romantic reunion, of course (and thankfully) - but Addison and Derek are back together on Grey's Anatomy at least for one week, sparring over surgery.
