Comedian Kenan Thompson was announced as Simon Cowell’s temporary replacement on the forthcoming “America’s Got Talent” episode as the latter recovers from back surgery. “A comedy legend is taking over the Judges’ table!” the NBC competition series announced via Instagram Saturday alongside a photo of the “Saturday Night Live” star. “Kenan Thompson is joining AGT as a guest Judge! 🎉.” Thompson, 48, will appear on Season 21 of the reality series alongside fellow judges Sofía Vergara, Howie Mandel and Mel B on Tuesday. It’s unclear whether the actor will appear in the following five remaining episodes of “AGT,” or if other surprise judges…
