If you thought the Rozlyn Papa sex tape scandal was the most unexpected story in the adult genre today, wait 'til you read this N.Y. Daily News item on 50 Cent.

Lastonia Leviston claims the rapper posted her personal sex tape online, dubbed in his own commentary and spliced himself into the action in various costumes.

She filed papers in Manhattan Supreme Court saying that she and Maurice Murray "videotaped themselves engaging in sexually explicit activities" in June 2008.

Leviston claims she requested Murray destroy the tape and that he agreed, but he allegedly "transferred or sold" it to 50 Cent instead for reasons unknown.

"Ooh, she grindin', is she a grinder?" 50 says while a lingerie-clad Lastonia Leviston romps around on a leather couch with a man whose face is blurred out.

50 Cent - who takes on the "Pimpin' Curly" persona in the video (above) - is accused of having posted the raunchy, 13-minute sex tape on several websites.

The reason? Beef with rival rapper Rick Ross, obviously. He refers to the girl in the X-rated video as a "nasty b----" and describes her as Ross' baby mama.

"Ricky don't know how to do that!" Fiddy taunts after a man in red boxer shorts (presumably Murray) bends over Leviston and begins "smackin' dat a$$."

Ross and 50 have a long-running dispute in which they've dissed each other in videos and songs. In the sex tape, he mocks the size of Ross's manhood.

"Yeah man, nice little slut!" the rapper says, quite originally.

Leviston, who wears little more than heels and lingerie during the sex tape, is seeking damages for emotional distress and unauthorized use of her image.

Hey, all's well in hip-hop beefs. As long as he left Shaniqua Tompkins out of this. We don't need any more restraining orders or houses burned down.