TMZ has obtained documents, filed today in Los Angeles County Superior Court, in which Knoxville (real name P.J. Clapp) cited "irreconcilable differences" in his nearly twelve-year marriage to wife Melanie.
We're told there is no prenup and Knoxville will pay spousal support. He's asking for joint custody of the couple's only child, 11-year-old daughter Madison.
Interestingly, Knoxville's lawyer, disso-queen Laura Wasser, signed the divorce petition last January but it wasn't filed until today.