Johnny Knoxville married longtime girlfriend Naomi Nelson Friday, a source told UsMagazine.com.

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The 39-year-old actor and "Jackass" star gave Nelson a 2.50 carat Edwardian engagement ring from the Platt Boutique Jewelry in Los Angeles.

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

The couple had a baby boy, Akira Clapp, in December.