Johnny Knoxville, Wife Melanie Separate
02/02/2007 AT 04:30 PM EST
"They've been separated for quite some time," Knoxville's publicist, Amanda Silverman, tells PEOPLE. No legal papers have been filed.
Knoxville, 35, and Klapp wed in 1995. They have one child, daughter Madison, 10, whose name Knoxville has tattooed on his chest.
After filming 2005's The Dukes of Hazzard, Knoxville and costar Jessica Simpson, then married to Nick Lachey, both shot down rumors that they'd had a fling.
"Usually you just laugh and go on. [But] if it's something like they've done to Jessica and I, it's not as funny because I have a wife and kid," he told a reporter in August 2005. "Luckily, my wife is understanding. It's show business."