Jerry Seinfeld is set to temporarily take over as co-host of Live! after Regis Philbin's final show on Friday. Hey, when did Seinfeld and Philbin get so close, anyway? And why is Philbin on the cover of Newsweek with him instead of with longtime friend David Letterman? That's what a jealous Letterman wanted to know when he asked Seinfeld about his relationship with Reeg on tonight's Late Show.