A New York judge rebuffed the rapper's request to dismiss Lastonia Leviston's claim in a ruling made public Thursday. Lawyers for both sides haven't returned calls seeking comment.
The lawsuit concerns a videotape Leviston made with a boyfriend in 2008. The judge's decision says the boyfriend later provided the tape to 50 Cent without Leviston's permission.
The rapper used the footage to make a video featuring himself as a character named Pimpin' Curly.
He says he wasn't responsible for the video's 2009 release. But he says it was legally fair to use the images.
The woman's lawsuit seeks unspecified damages.