By Lindsay Lowe | (staff@latinospost.com) | First Posted: Feb 02, 2013 01:16 PM EST

New tabloid rumors have been circulating that Bruce Jenner, the patriarch of the Kardashian family, is not the biological father of his youngest daughter, Kylie Jenner.

Kylie, 15, took to Twitter Friday night to lash out against the rumors surrounding her paternity, calling them completely unfounded:

"It sickens me how editors of a magazine can proudly write a story denying that 15 year olds father is actually hers," she tweeted. "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."

Kylie posted around 20 tweets in a row in her rant against tabloid gossip, saying near the end:

"To whoever took the time to type those words onto that magazine..DO YOU HAVE A HEART?" and "I'm gonna find out if this is legal...like it shouldn't be legal to publish harmful false information about a minor...should it? lol.."

Luckily, Kylie's older sisters Kim and Kourtney have her back. Kourtney tweeted,

"That was some rant @KylieJenner but I just want to say that I am proud and honored to have you as my sister. What a well spoken young lady!"

Related: Kim Kardashian's Twitter Salary is Insane --- She Gets Paid HOW Much Per Tweet?

Then the next morning, Kim retweeted Kourtney's message of support, adding,

"I couldn't agree more! #soproud."

It can't be easy dealing with tabloid gossip, especially at such a young age, but at least Kylie has her sisters to support her!

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