"Keeping Up with the Kardashians" star Kylie Jenner has allegedly been stalking a teenage girl for three years over ex-boyfriend Jaden Smith, reports TMZ.

TMZ received legal documents filed by 17-year-old Chelsea Clark that state Jenner was furious because Smith, 17, wanted to date Clark. She claims that Jenner called her and said, "Leave my boyfriend alone cause you will never be like me."

Clark also accuses Jenner of having people follow her and sending her threatening messages via social media.

Jenner said, "This is war," according to Clark.

The accusations get even more disturbing as Clark alleges that she suffered a back injury in a car accident which she believes Jenner caused.

A temporary restraining order request by Clark was denied by the court. She was asked to bring the threatening messages to court on Monday, but she was a no-show. A hearing has been scheduled for Oct. 9, according to TMZ.

Jenner's representative told TMZ she's never heard of Clark.

Could Jenner still have feelings for Smith? It would not be the first time the 18-year-old has feuded with a rumored girlfriend of Smith.

Latin Post reported in July that "Hunger Games" actress Amandla Stenberg, 16, who took Smith to her prom in May, got into a feud with Jenner after slamming her on Instagram for wearing cornrows in a photo.

Also in July, Hollywood Life reported that Jenner and Smith began talking after her feud with Stenberg, and he has expressed concern about her relationship with rapper Tyga.

Smith felt compelled to reach out to Jenner, according to the tabloid.

"He also told her he heard some things and was worried about her," an insider told Hollywood Life. "Jaden hopes she knows what she's doing with Tyga. He's older and has a kid... and then all these stories come out about him texting -- he just hopes she isn't getting in over her head in this relationship."