Credit: Jamie McCarthy/

Jackass stars Johnny Knoxvile and girlfriend Naomi Nelson have welcomed a new baby boy, according to the Los Angeles Times.

Rocko Akira Clapp -- who weighed 8 lbs. and measured 20 inches -- was born Sunday in Los Angeles.

It is the second child for Knoxville (real name: Phillip John Clapp), who has a teen daughter, Madison, with his ex-wife, Melanie Clapp.

Before his new son's arrival, Knoxville blogged, "My daughter Madison [mom is ex-wife Melanie Clapp] has already started becoming a big sister too and is helping pick out clothes, strollers and beds for her new little sister or brother."