Johnny Knoxville: Baby on Board!

Jackass star Johnny Knoxville is going to be a father again.

“He’s telling people that his girlfriend, Naomi [Nelson], is three months pregnant,” an insider close to the gross-out guru tells Life & Style. “He’s excited – and a little nervous.”

Johnny, 38, and Naomi started dating in September 2008.

“He talks all the time about marrying her,” says the insider. “Unlike his rocky first marriage [to Melanie Clapp], he wants to set up a really stable, normal household. His wild days, at least when it comes to relationships, are behind him.”

Johnny‘s 12-year marriage to Melanie ended in 2007 (they have a has a 13-year-old daughter, Madison).

“He’s found a degree of peace with Naomi,” says the insider. “He treats her like an angel and keeps reminding her that all his strange stunts are just part of his job.”

UPDATE: Johnny‘s rep tells Us Weekly, “Yes, they are expecting and very excited.” Naomi is three months pregnant.