IF YOU HAVE NOT READ THE BOOKS>>>WRONG THREAD.
Hey. It's sort of a 'who cares' in the books, but Joff's upcoming wedding 'present'...who did it? They sure are muddying the waters. I would ALMOST bet on Cersei at this point. Removes the Tyrell threat and thus absolves her of her marriage. The fact that she can frame her brother is icing on the cake...don't forget, his marrying Sansa puts him in a position of power as far as the North.