Private Practice-Grey's Anatomy Crossover Details!
TV Guide has the details on the February 5 and February 12 episodes of Private Practice and Grey's Anatomy, in which the show's characters will be intertwined in a story line.
Sam, Naomi, Addison and her brother Archer all visit pay a visit to Seattle Grace on the 12th after Archer (Grant Show) returns to Oceanside on the 5th with a brain disorder.
There, according to the photo below at least, Addison and Mark reunite. Check out the scan below for more details on this Grey's Anatomy-Private Practice event...