The secret behind Kylie's plump pout was finally out as the 17-year-old reality star admitted that she got lip fillers.

During last night's much-anticipated episode of "Keeping Up With The Kardashians," Jenner admitted that her oversized lips are a result of temporary fillers and not just because of "over lining her lips."

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Kendall Jenner and Kim Kardashian sat down with Kylie to discuss her massive pout. Kardashian told Kylie her lips looked amazing to which Kylie responded that Kendall said that they looked rather mahoosive.

Kendall added that though she thought Kylie's lips looked great and really natural when she first had them done, she is now concerned about her going too far, and does not understand why Kylie felt the need to get them plumped up in the first place, according to Sugarscape.

Apparently the gorgeous model Kendall failed to understand why they were freaking out, adding that "No one needs anything. Everybody looks beautiful."

Kardashian however stood up for Kylie saying that if something makes you insecure, do what makes you happy. After all, who does not want to look amazing? She added that there is nothing to be ashamed about as it is simply handling things the right way.

However, the reality star advised her to keep everything subtle and not to go overboard, Mirror noted.

Kardashian even warned Kylie to be honest if someone asks her about her lips, adding that it is not big of a deal. While chatting at a book signing for her new book of selfies, "Selfish," Kardashian said that she is totally proud of her little sister for making the confession, and even revealed that she had planned to get her lips done for years

The episode even saw big sister Khloe and her friend Malika calmed Kylie down saying that people were there to "trip them up."

TagsKim Kardashian, Kendall Jenner, Kylie Jenner, kylie jenner lips, Keeping Up With The Kardashians