Jessica SimpsonFollowing in the footsteps of McFly and Lindsay Lohan, the Jackass boys have reportedly recorded an X-rated song about Jessica Simpson for their new movie.

Jessica was rumoured to be having an affair with Dukes of Hazzard co-star Johnny Knoxville during filming at the start of 2005 but then in May, Jackass star Bam Margera’s father told a US radio station that it was Bam, not Johnny, that had done the dirty deed.

The DJ asked Bam’s dad, Phil: “Is Bam nailing Jessica Simpson? Is that what’s going on?” and Phil replied: “He’s never lied to us, and he said he did.”

Now Bam and Johnny’s co-star Chris Pontius has written a song about the incident - which would have happened while Jessica was still married to Nick Lachey - and according to the New York Post, the song describes a “kinky form of intercourse that can’t be printed in a family newspaper”.

The song will be featured in Jackass: Number Two, which will be released later this year.