Jessica Simpson is beside herself with worry over fears that a secret sex tape featuring the blonde engaged in a number of sex acts with ex-husband Nick Lachey could soon leak to the Net.

The footage has reportedly fallen into the hands of the same individuals responsible for leaking the Pamela Anderson and Tommy Lee sex video, and the thiefs are threatening to leak the tape if Jessica does not pony up an undisclosed amount of dough.

“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,” a source told the Daily Sport of the alleged X-rated flick.