Conversation so far:
who has been a judge on america's got talent
Judges for America's' Got Talent include Piers Morgan, David Hasselhoff, Brandy Norwood, Sharon Osbourne, Howie Mandel, Howard Stern, Mel B, Heidi Klum, Simon Cowell, Julianne Hough, and Gabrielle Union

Question: how many hosts has the show had
Self-contained rewrite: how many hosts has america's got talent had