Rumors of Katherine Heigl and T.R. Knight leaving the cast of Grey's Anatomy surfaced recently, and they wouldn't be the first to hightail it out of Seattle Grace, but there's one doctor who might be a great replacement on staff. Kate Walsh, who reprised her role of Addison on last week's eppie, says she could return to the show! "I might," Kate hints to Us. "I'm not gonna say. Who knows what's in the mind of [show creator] Shonda Rhimes." What do you think? Could Addison mix it up a bit on the show, or are you so over her character?