Kendall and Kylie Jenner are rumored to be at war over which one of them is the "hottest" sister, reportedly putting their "Keeping Up With the Kardashians" reality spin-off show in grave danger.

Radar Online reports the feud between the teenage sisters has gotten so bad they could end up cancelling their potential spin off before it even has a chance to start.

"Kendall is just not having it anymore," a source said. "She does not want to be a part of this spin-off because Kylie is trying to make it all about her. More and more, she thinks that Kylie's complete intent with this is to turn it into the 'Kylie show guest-starring Kendall.'"

Word is, after undergoing a number of cosmetic procedures, the increasingly popular Kylie has turned into a diva much like older sister Kim Kardashian. Even the entourage of rap star Tyga's girlfriend has started to cause issues for some of those close to her.

"Kylie and Kendall run with such completely different crowds and Kendall really feels that mixing their two lives into one is going to be near-impossible," a source added. "Simply put, most of her friends cannot stand to be around Kylie's crowd."

Reports are Kendall's Calvin Klein model friends now refer to her sister's pals as "ratchet fame wh*res."

Rumors of the sisters launching their own reality show have been running rampant ever since early summer, when a top executive of a major production company admitted he was open to the prospect.

"We would love the opportunity to do that show," said Gil Goldschein, head of Bunim/Murray production. "There haven't been any discussions, but if that were of interest to them, certainly I would hope that they would talk to us about that possibility."

There have also been recent rumors of Kylie and Tyga launching their own reality show.