Kim Kardashian West is ''jealous as hell'' of her sister Kendall Jenner.
The 'Keeping Up With The Kardashians' star is said to be becoming increasingly annoyed by the amount of attention the 19-year-old model is receiving after she was unveiled as the face of cosmetics label Estee Lauder last month, causing a ''lot of tensions'' between the pair.
A source close to the siblings told OK! Magazine: ''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.''
Kendall also hit out at her older sister - who recently posed in a controversial nude photo shoot for Paper magazine - slamming her ''over-sexed antics'' and branding the photographs ''cheap and nasty.''
Kim, 34, isn't the only member of the famous family who is unhappy with the brunette beauty's recent behaviour.
The source added: ''It's very ugly between these two right now, and Kendall's alienating most of the family with her self-entitled, Queen Bee attitude.''
However, Kim - who has a 17-month-old daughter, North, with her husband, rapper Kanye West - has vowed to do whatever it takes to steal the spotlight away from her younger sister.
The insider said of her decision to pose naked: ''She wanted people to be in awe of her body, not slamming her for being an irresponsible mom.
''But Kim will do whatever she has to do to stay relevant.''