New reports claim that a feud has come between the Jenner sisters, Kendall and Kylie. Apparently, 17-year-old Kylie deliberately missed her 19-year-old sister's birthday luncheon on Monday because they've been feuding.

The Jenner sisters who were once best friends have turned into family "frienemies" since they were torn apart by their relentless drive for fame, according to Radar Online.

"It is a competition between them now as to who can be the more famous Jenner and it is destroying their relationship," a source close to the family told Radar.

There is an alleged sibling rivalry going on between the sisters and it has gone bad this time since the feud has affected their relationship.

Kylie Jenner is the youngest among the Kardashian sisters - Kourtney 35, Kim 34, Khloe 30, and Kendall 19.

The youngest Jenner is currently focused on becoming a pop-star. She has been taking vocal lessons from Tim Carter, the producer of the hit "Whip My Hair" which was sang by Willow Smith, according to Radar Online.

The family insider of the Kardashian/Jenner family told Radar that the youngest Jenner sister thinks that her music career is going to take off and she is getting her name out there right now.

She feels like her older sister Kendall abandoned her when her modeling career took off, added the insider.

The 17-year-old Jenner is seemingly often left to either join adult things or living an adult life without parental supervision, writes Hollywood News Daily.

On that note, the Kardashian/Jenner family may be falling apart since the older Jenner sisters, Kim and Khloe Kardashian, have also been fighting over Kim's ego.