His girlfriend gave birth to a baby boy, Rocko Akira Clapp on 20 December 2009.
Knoxville also went on to appear in subsequent movie versions of the series and had roles in Hollywood films including Men in Black II, The Dukes of Hazzard and Walking Tall.
She again gave birth to a daughter, Arlo Lemoyne Yoko Clapp in October 2011.
Knoxville has featured on the cover page of GQ magazine two times and has tattooed his first daughter name on his chest. Knoxville currently lives in Los Angeles, California, the United States with his family.
During their short romance - which began after they finished filming The Jump - Stacey showed off her more fearless side as she took part in one of Steve-O's iconic yet dangerous stunts, filming him as he laid on the floor in her kitchen under a knife placed lightly in the ceiling.
Along with a cute black and white snap, showing her sat on her man's lap while cuddling, she wrote: 'It gets harder every time!