In one of those rare talk show appearances, Letterman will grace the stage of Live with Regis & Kelly for Reege’s triumphant return following heart surgery. Letterman’s guest appearance shows his continuing friendship with Regis, who filled in when Letterman was out with shingles in 2003. Regis was also the first guest booked on Late Night after Letterman returned from a quintuple-bypass surgery. Regis returns to his gabfest on Thursday, just six weeks after a triple-bypass heart surgery. Their ticker problems are not all the hosts have in common—they also share a doctor, since Dr. O. Wayne Isom performed both of their surgeries. Philbin’s return seems speedy, but it’s likely that fans have been missing him after the multitude of fill-in hosts. Regis returns just in time for May sweeps… after all, the show must go on!