"Buckwild" star Shae Bradley -- whose latest role is in a hillbilly sex tape -- thinks it's her creep ex-bf Jesse J who's been pimping their homemade porn ... and she wants no part of it.
Shae tells TMZ ... "The materials are being used against me and it should be illegal. I am ashamed of my mistake and deeply regret it."
She may want to reconsider ... TMZ has learned YouPorn.com is willing to pay Shae $50,000 in cash if she'll sign off. To sweeten the deal they'll throw in a year's supply of cigarettes ... any kind her hillbilly heart desires. But Shae tells us ... "No way."
TMZ broke the story ... the on-again-off-again couple videotaped themselves having sex a year before they became reality stars.
But sounds like Shae wants more than smokes and dead presidents to let the vid go public.