Kylie's Humiliation! Graphic Screenshot From Alleged Sex Tape Leaks

Is Kylie Jenner following in her older sister Kim Kardashian's footsteps? RadarOnline.com exclusively learned a mysterious party has been shopping around a graphic screenshot that is claimed to be from a sex tape Jenner made with Tyga before their breakup.

RadarOnline.com has viewed the X-rated photo at the center of the new allegations. A grainy screenshot, it features a young woman performing a sexual act on an African-American male. There are no identifying marks that suggest it is Jenner or her ex-boyfriend.

According to the party attempting to sell the photo, it is allegedly a screen grab from a sex tape that was released on Tyga's website on May 18.

The seller claims the full video is 14 minutes long, and was taken down from the rapper's website shortly after it was posted.

However, RadarOnline.com has viewed the cached versions of Tyga's website, and there is no record of such a post.

What's more, family insiders insisted that any suggestion that it's Jenner, 18, in the photo is "BS."

"Tyga is not stupid enough to go against Kardashian lawyers and break an NDA," a source close to the family told RadarOnline.com. "Kris told him flat out that if he ever messes with Kylie's image, she will personally destroy him, and Kanye will make sure he never works again."

"If Tyga does have video of him and Kylie having sex it will never see the light of day," the source insisted.

Reps for Jenner and Tyga did not immediately respond to RadarOnline.com's request for comment.