Kylie Jenner has come clean about her mysteriously fuller lips.

Jenner admits to lip injections in a preview clip from this Sunday's episode of "Keeping Up with the Kardashians."

In the clip, the youngest Jenner sits down for an interview and gets asked about her lip routine. She reveals that she uses multiple colors, but stays mum on the lip fillers that she finally admits to in confession.

"I have temporary lip fillers, it's just an insecurity of mine and it's what I wanted to do," the 17-year-old reality star says.

She also justified her answered to the reporter as not a complete lie.

"Everyone always picks up apart," Jenner says. "I want to admit to the lips, but people are so quick to judge me on everything, so I might have tiptoed around the truth, but I didn't lie."

Jenner's plumper lips caused a dangerous social media trend dubbed the "Kylie Jenner Lip Challenge." Fans tried to achieve the fuller lip look by sucking a shot glass, sometimes resulting in burst blood vessels.

Bruce and Kris Jenner's youngest took time to address the challenge and encourage her fans to stop hurting themselves.

"I'm not here to try & encourage people/young girls to look like me or to think this is the way they should look," Jenner tweeted on April 21. "I want to encourage people/young girls like me to be YOURSELF & not be afraid to experiment w your look."

"Keeping Up with the Kardashians" airs on Sundays at 9 p.m. on E!