Kylie Jenner, the youngest "Keeping up with the Kardashians" star, admitted to using lip fillers, after insisting for months her plump lips were all natural.

"It's just an insecurity of mine, and it's what I wanted to do," the 17-year-old said during a sneak peek of an upcoming episode.

Jenner admitted to using temporary lip augmentation, which likely means a medical professional numbed her lips and then injected a hyaluronic acid.

There are several types of hyaluronic acids, but they all work by works essentially adding moisture and cushioning to the skin.

Hyaluronic acid -- which does not strip the skin the way most acids do -- is a naturally-occurring polysaccharide in the eyes, joints and in between the skin cells, according to a feature by Beauty Editor. It acts as a smoothing agent for skin, and as humans age, our bodies produce less and less of it.

Injection results typically last between six and nine months before a patient needs another lip augmentation, New York City plastic surgeon Dr. Matthew Schulman told People.

Side effects can include bruising, scarring and infections on rare occasions. But the procedure seems to be safer than the Kylie Jenner Lip Challenge.

"I don't think there's a safety concern," Schulman said of Jenner's lip filler treatment. "I think the bigger concern with her being 17 is more of a psychological concern: whether she's old enough or mature enough to undergo body transformation."

The next "Kardashians" episode airs Sunday at 9 EST on E!.

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