The trio will join Cowell, who replaces DJ Howard Stern on the panel, when it returns to screens later this year, reported Female First.
NBC President of Alternative and Late-Night Programming Paul Telegdy said in a statement, "Howie, Mel and Heidi have an undeniable chemistry together and bring unbridled energy to everything they do. We are very excited to bring them back along with Nick Cannon as host, and with the addition of creator Simon Cowell as a judge, the panel just got a little more interesting. We can't wait for the new season to begin."