Kim and Kourtney Kardashian praised Kylie for standing up for herself after the youngster faced accusations that she is not really Bruce Jenner's daughter.
The 15-year-old reality TV star started her rampage addressing an unnamed magazine for posting what she called a fictitious story.
'It sickens me how editors of a magazine can proudly write a story denying that a 15 year olds father is actually hers,' she began.
'Yes, my father is my father and no my parents aren't getting a divorce. You guys can't believe any of these magazines. It's all bulls**t.'
She continued: 'And even though I don't let these stories get to my head. Imagine you at 15 & someone telling you your father isn't your father.'
'EWWWW people disgust me. You're all pathetic.
'Wait. But you're ACTUALLY pathetic. Going after a 15-year-old and telling her her father isn't her father. Like WHAT? Are you insane?
'This makes me so mad. And I'm not taking the time to write all this because this hurts me. I'm writing this for the other teens my age.'
Kourtney, 33, publicly offered her support to Kylie shortly afterwards, writing: 'That was some rant @KylieJenner but I just want to say that I am proud and honoured to have you as my sister. What a well spoken young lady!'
Pregnant Kim, 32, later added: 'I couldn't agree more #soproud.'
Kim herself was the recent target of cyberbullies after she and her family members posted snaps of her partying with beau Kanye West on New Year Eve -- just as the couple announced they are expecting a child.
Commenters turned on the reality star, leaving thousands of cruel remarks.
Many of the social networking site users made statements about the socialite’s weight and criticised her for being in a club while pregnant.
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