One of the two photos, which popped up on nudie website Fleshbot, has been confirmed by Warner as being the Veronicas singer. The other shows a brunette woman with her chest exposed wearing fishnet stockings.
"The portrait photograph of the girl looking at the camera is obviously Jess but, although the photos appear to have similarities in style and setting, I'm confident that the girl in the topless photograph is not her," a Warner Music publicist told The Daily Telegraph.
Before Warner were reached for comment, we identified the first pic as being of Jess due her distinctive tatt on her shoulderblade, which appears flipped in the picture, possibly due to the pic being taken by a webcam.
Check out more naked photo scandals in our gallery below!