Johnny Knoxville of MTV's "Jackass" and some various forgettable movies is separating from his wife of twelve years. Mollygood reports:

Johnny Knoxville is separating from his wife of more 12 years amid rumors that he has been unfaithful, specifically with Dukes of Hazzard co-star Jessica Simpson.
Knoxville, 35, and his wife Melanie have been married since 1995, but rumors of infidelity reportedly have hurt the relationship. While filming The Dukes of Hazzard, there were wide-spread rumors that he was having an affair with co-star Jessica Simpson, although both parties have denied it.

According to one source, the blame should be put all on Knoxville. "How do you live knowing that your husband leads a separate life... and is sleeping with other women all the time? She deserves every penny if she is going to divorce him," the source told Us.

The couple has one daughter, Madison, 10.

When asked about the separation, Knoxville said, "This is a very painful time in my life. Watching my marriage dissolve hurts worse than having my nipples bitten by a baby alligator or being speared by a yak while blindfolded."