Johnny Knoxville welcomes son Rocko

By Tanner Stransky Updated December 23, 2009 at 02:10 PM EST

Jackass star Johnny Knoxville (né Phillip John Clapp) and girlfriend Naomi Nelson welcomed a son, Rocko Akira Clapp, on Sunday, according to People. Rocko weighed in at 8 lbs. and measured 20 inches long. Knoxville already has one daughter, Madison, 13, from a previous marriage.