LATEST: Jackass star Bam Margera has re-ignited rumours he slept with Jessica Simpson while she was still married after appearing on the Howard Stern radio show on Tuesday (19SEP06). Margera's former fiance, JENN RIVELL, told a Pennsylvania radio show in 2005 that Simpson and Margera had sex while the pop star was still married to Nick Lachey. At the time, Bam's father PHIL MARGERA also told Philadelphia radio deejays PRESTON + STERN his son admitted bedding Simpson. Stern interrogated Margera on his show, asking about the night the two spent together while she was filming The Dukes of Hazzard with his Jackass co-star Johnny Knoxville. Margera said the relationship was blown out of proportion, but admitted he "bumped into Simpson", which caused his fellow Jackass co-star STEVE-O to say suggestively, "Yeah, BUMPED into her!" Margera claims they "wound up at her parents house drinking margaritas and it went from there" and said afterwards he "left at eight in the morning". When Stern asked Margera if Simpson looked good naked, he said she had a personal trainer for the film adding, "Yeah, she looked good. I can't deny that!"