On this week's episode of 'Gossip Girl,' called 'Blair Waldorf Must Pie,' B's father—whom, you'll recall, ran off with a male model—reveals his identity at last. He'll be played by John Shea, best known as Lex Luthor from 'Lois & Clark: The New Adventures of Superman.' At nearly 60, he will also be the only parent on this show old enough to look like he could have sired a teenager post-being one.