The couple welcomed son Rocko Akira Clapp on Sunday night in Los Angeles. The baby weighed in at 8 lbs., and measured 20 inches long. Both mother and son are doing well, reports the Los Angeles Times.
In announcing the pregnancy in August, the actor and former Jackass star, 38 – whose real name is Philip John Clapp – said he was "excited as hell" to meet his baby-on-the-way.
Rocko joins Madison, Knoxville's 13-year-old daughter from a previous marriage.
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