The model, who dumped the troubled rocker earlier this month, made eight video diaries with Pete during their turbulent relationship.
After their messy split, Kate found six of the tapes but is concerned that Pete, who is a self-confessed drug addict, could sell the missing two.
A source told Britain's The Sun newspaper: "There are still some bits and pieces floating about of Pete with Kate. She has got rid of most of it. Six out of eight tapes have been destroyed.
"But she wanted to bury the lot before he could humiliate her by selling them or putting them on the internet."
Some of the clips have already been posted on the web by the couple before they separated. One short video featured the pair singing together and the Babyshambles frontman serenading a scantily-clad Kate.
The source added: "When those clips came on the net, Kate could obviously decide with Pete what was going to be made public.
"Now, with the remaining two tapes, she has no say."
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