Natalie Dormer, formerly of "The Tudors," has signed on as a series regular for season two of HBOs swords-and-dragons hit "Game of Thrones," the cable outlet confirmed to TheWrap on Thursday. British actress Dormer, who played Anne Boleyn on Showtime's randy royalty drama, will portray House Tyrell member Margaery Tyrell. Related Articles:? 'Game of Thrones' Slays 'The Killing': A Tale of Two Finales 'Game ...