Julianna Margulies is glad that she and her former ER costar George Clooney never brought their on-screen romance into real life.The actress was on an episode of the Armchair Podcast this week, where she talked to hosts Dax Shepard and Monica Padman about the nature of her relationship with Clooney. While both of the ER stars appeared to have a crush on one another, neither of them acted on it off-camera.