In the same week that saw Grey's Anatomy bid farewell to original cast member T.R. Knight, one of last season's top recurring characters is signing on full-time.

Jessica Capsaw, who plays the oddly-named but wonderful Dr. Arizona Robbins, lesbian love interest of Sara Ramirez's Dr. Callie Torres, is now a series regular.

Creator Shonda Rhimes has described Callie and Arizona's chemistry as Mer-Der like. Not sure about that, but she certainly is a talented, beautiful addition.

Follow the link to read more about Jessica's promotion!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.