What do Mary J. Blige, Clay Aiken and Elvis Costello have in common? All three are the latest celebs to make cameos on “30 Rock.” According to a spy, the trio was on the show’s set Wednesday, hanging out with Tina Fey and company. “They were psyched to meet Tina,” our insider reports. “But it was Alec Baldwin who had everyone cracking up — that guy is hilarious!”
No date has been announced as to when Clay will appear on the show.