Despite publicly stating that she is extremely proud of her sister Kylie Jenner and her blossoming modelling career, Kim Kardashian is said to be "jealous as hell" of her younger sibling.

After 19-year old Jenner was officially made the face of Estee Lauder last month, Kardashian was said to have been so jealous that the public's attention is now on her younger sister, especially since the reality star had dreams of becoming a legitimate model herself - but couldn't because of her height.

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Jenner's fame is said to have caused a lot of tension between the siblings.

"Kim is particularly jealous of Kendall and has it in her head that she's taking a ton of business away from her, so the knives are really out. They've had a lot of tensions recently, but the money-spinning Estee Lauder deal really pushed Kim's buttons and she's jealous as hell," a source close to the two reality stars shared with OK! Magazine.

The 34-year old reality star and mother of one is said to be determined to take back the spotlight from her sister.

Recently, Kardashian posed nude for Paper magazine - both frontal and back. Allegedly, her purpose for doing the photo shoot was to have people in awe of her body; instead, many are criticizing her for being an irresponsible mother.

The source shared, however, that despite criticisms, Kardashian will do just about anything to stay relevant.

Following the magazine's release, Jenner slammed her older sister for posing nude, saying that Kardashian's pictures were "cheap and nasty", and that she was presenting herself as "oversexed".

However, it seems that Kardashian's narcissism isn't the only issue hovering over the family.

Allegedly, Jenner's recent fame has also alienated other members of the family, with her siblings feeling that she has developed a "self-entitled, Queen Bee attitude".