Jessica Simpson has been left reeling by rumours a sex tape starring her is about to be leaked onto the internet.The alleged X-rated home movie is said to show the 'Dukes of Hazzard' actress and her ex-husband Nick Lachey engaged in a number of sex acts.A source told Britain's Daily Sport newspaper: "Jessica is horrified her name and sex tape are being mentioned in the same sentence. She's always been a girl of high morals and principles."According to reports the tape does exist and has fallen into the hands of the individuals responsible for leaking the Pamela Anderson and Tommy Lee sex video. It has been claimed that they are threatening to leak the tape if Jessica does not pay an undisclosed sum of money to keep it out of the public domain.The 25-year-old star has always prided herself on making men wait for sex.She once said: "I play hard to get. If you turn sex down for a couple of days it makes it better."

Jessica's ex-husband Nick is now dating MTV presenter Vanessa Minnillo, while she has been seen dining with on/off lover John Mayer again.

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