Detailed Instructions: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Q: Season thirteen of the reality competition series America's Got Talent premiered on May 29, 2018, on NBC. Howie Mandel, Mel B, Heidi Klum and Simon Cowell returned as judges for their respective ninth, sixth, sixth, and third seasons. Meanwhile, Tyra Banks returned for her second season as host.
A:
who are the judges on america's got talent this season