has filed a $20 million libel suit against
, charging that a story published about her and hubby, Kevin Federline
, fretting over the possible leak of a homemade sex video is patently false. "There is no such video," declares the lawsuit, which seeks $10 million in libel damages, another $10 million for misappropriating Spears' name and image to promote sales, and other unspecified punitive damages. "Not that my punitive has ever been damaged, heh-heh," K-Fed says with a wink. And then a burp.