The AGT host made things awkward last month when he surprised Burr by bringing on his alleged half-brother Corgan.

Oddball comedian Howie Mandel has charmed audiences for years ... I made light of bulimia, which is a very serious eating ...

"I feel horrible," Mandel said on the latest episode of his "Howie Mandel Does Stuff" podcast. "I'm sorry, Bill. I'm sorry, Billy. I only tried to do something good." Mandel said it had been a ...