Kylie Jenner’s SexTape Nightmare: The reality star’s devastated as rumors of compromising footage begin to circulate around Hollywood.

First her claim to being the youngest self-made billionaire was called into question, and now this: “Kylie’s friends are buzzing about rumors of a sex tape circulating,” an insider tells Star. “She’s freaking out because this is not the kind of attention she wants right now.” (Her rep denies Star’s story.) Despite her reality-show upbringing, the makeup mogul can be very protective of her privacy. After all, she managed to keep her entire pregnancy with daughter Stormi,

2, a complete secret (dad is her ex Travis Scott). Still, notes the pal, the 22-year-old “made a huge name for herself as a sex siren and a social media star.”

And on her way up, adds the pal, “she made some stupid mistakes.” So, with one of them apparently coming back to haunt her, she’s calling in the big guns — namely momager Kris Jenner. “She and Kris have made these things disappear in the past,” says the pal. “That’s the benefit of being a billionaire!”