Jimmy Kimmel made a major announcement on an episode of "Ellen": He's about to be a dad again!

"I'm having a baby," he told host Ellen DeGeneres, adding jokingly, "With Ellen."

Actually, it's his first with wife Molly McNearney, he revealed to DeGeneres during an interview that's scheduled to air Wednesday.

When asked if he'll be an involved dad, Kimmel said, "Well, I have two kids already. I don't know where they are, but I hear they're doing great...I have a 20-year-old son and a 22-year-old daughter and I've really forgotten everything [about raising kids]."

"It's weird, at my age," added Kimmel, 46. "I'm going to be one of those old dads."

You can watch part of the interview here...