Tom Bergeron will soon be back in the Dancing With the Stars ballroom to celebrate the show's 20th anniversary. Good Morning America announced on Wednesday, November 5, that Bergeron, 70, will serve as the guest judge for the 20th Birthday Party episode of the ABC reality competition series. "It feels really good [to be back], I'm really looking forward to it," Bergeron said on Wednesday, adding that he's been "reminiscing" on all the fun he had hosting the show. "I think 20 years of any primetime show is amazing.