Keeping up with Kendall!
According to In Touch, the 17-year-old is jealous of international "It" girl Kendall's modeling success.
"Kylie is bitter that Kendall is doing better than her and it's driven a wedge between them," a source tells the magazine. "They barely speak."
"Kendall is jet-setting around the world with her celebrity friends while poor Kylie is at home moping around," the insider adds of the stunning 19-year-old.
It's no wonder Kylie is showing off what appears to be a nipple ring on Instagram.
"She feels like the black sheep of the family," the source explains. "And completely left out."