After almost a year of speculation, the truth is finally out. Even though Kylie Jenner has been denying it for months now, her sister Kim Kardashian has let the cat out of the bag by admitting that the 17-year-old has been "plumping" her lips.

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According to OK! Magazine on Wednesday, Khloe made the revelation during a preview clip of the next episode of their reality show, Keeping Up With The Kardashians.

Khloe said, "Kylie decided to get her lips plumped. It is right to cop up to it."

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Just recently, Kylie made it clear that she wants the media to stop talking about her lips.

The Keeping Up With The Kardashians star - who is looking more and more like her older sister Kim Kardashian these days - has once again gone on the record to say that she's never had any plastic surgery done.

In a new interview with Britain's Grazia magazine, the 17-year-old says, "I'm like, 'Stop talking about my lips. I haven't had plastic surgery. I've never been under the knife. People flashback to pictures of me when I was 12 and say 'Kylie's so different' but how can I look the same from 12 -18?"

Kylie has been heavily criticized ever since she debuted a new look last year. Many have speculated that she's had several surgeries done, in addition to her lips.

Tags: Kylie Jenner Khloe Kardashian