Credit: Giulio Marcocchi/Sipa Press.

Johnny Knoxville has walked down the aisle.

The Jackass star and girlfriend Naomi Nelson wed on Friday, a rep confirms to

Knoxville, 39, popped the question with a 2.50 carat Edwardian engagement ring from L.A.'s Platt Boutique Jewelry.

"Naomi was drawn to this ring because it is unlike anything she had seen--feminine, delicate and detailed," jeweler Larry Platt said of the bling.

The couple welcomed son Rocko Akira Clapp in December. (Knoxville also has a teen daughter, Madison, with ex-wife Melanie Clapp).