Wide World of Cheating- JESSICA Simpson and MTV star Bam Margera have denied hooking up, but it sounds like something went on. First, Margera’s dad told a radio host the two had sex. Now, Margera’s ex, “Jen,” told a Philly station: “Yes, he did [bleep] Jessica Simpson. I know this for a fact. He woke up in her bed. I have an e-mail. He told me all about it . . . The whole show [‘Newlyweds’] is a lie . . . Jessica started grinding up on [Margera at a concert in L.A.] and he was like, ‘What the hell? It’s Jessica Simpson’ . . . She [had sex with Johnny Knoxville] too while they were shooting ‘Dukes of Hazzard.’ ” A rep for Simpson said: “All lies and complete nonsense, none of this is true.” Full transcripts can be found on defamer.com.

Jen [Bam’s ex]: He cheated on me with 45-50 girls. Yes, he did F- Jessica Simpson.

DJ: And you know this for a fact?

Jen: I know this for a fact. He woke up in her bed. I have an email. He told me all about it.

DJ: How long have you guys been broken up?

Jen: Two and a half months. The whole thing is a lie. The whole show [Newlyweds] is a lie.

DJ: When did the whole Jessica Simpson thing go down?

Jen: It was in LA. He [Bam] was at a Hem [some band] show with Ryan [a fellow Jackass] and Jessica was there and she started grinding up on him and he was like, “What the hell? It’s Jessica Simpson.” I hope it burns when he pees! […]

DJ: This is going to get out and be a big bombshell for Jessica Simpson and her people

Jen: She humped PJ too while they were shooting Dukes of Hazzard. DJ: Who?

Jen: PJ. [Ohh] Johnny Knoxville [PJ is his real name]. She [Jessica] is as dumb as she looks.