Johnny Knoxville and Naomi Nelson Johnny Knoxville and Naomi Nelson

Baby No. 3 is on the way for Johnny Knoxville, the Jackass star announced on Facebook.

"My wife Naomi and i are super happy to announce that we are having another little bambino in the fall," he wrote. "My 15-year-old daughter Madison is very excited about it, and her 16-month-old little brother Rocko has, well, no clue. wahoo!!"

Check out photos of Johnny Knoxville

Madison is Knoxville's daughter from his first marriage. He and Naomi welcomed their first child together in December 2009 and married the following year in September.

Knoxville most recently appeared in Jackass 3D.