Paris Hilton's X-rated co-star, Rick Solomon, plans to sue his leading lady for defamation, claiming the hotel heiress wrongly accused him of releasing their homemade sex tape. Solomon's lawyer, Marty Singer, tells the New York Post that his client is suing "Paris, her parents and [publicist] Siri Garber for defamation." Solomon is probably also steamed about allegations that he took advantage of Hilton while she was nearly unconscious — which, if you've seen the footage, is a laughable idea. Paris is clearly wide awake, even vamping for the camera at one point. So I've heard.