Kylie Jenner is not a fan of secrets, especially when it comes to her famous family.

In her latest interview, the reality star reveals she knew about Caitlyn Jenner's transition longer than most people think.

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"I mean, obviously I knew about it my whole life, but it was never admitted to and then it was all said and done,” Kylie told Wonderland magazine. “I honestly just wanted to not be lied to. I just wanted honesty and no secrets.”

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The 18-year-old went on to explain, "I’m OK with everything, as long as everyone’s honest. I want to encourage people to live their life, you know?”

Kylie is not the first Kardashian member to admit they knew Caitlyn was transgender before her big Vanity Fair cover.

Kim Kardashian shared in the "About Bruce" special episode of Keeping Up With The Kardashians that she walked in on Caitlyn (formerly known as Bruce) dressed as a woman over 10 years ago, while Kendall Jenner confessed that she thought her dad was having an affair when she found things like makeup growing up.

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Kylie, who is on the cover of the magazine's "Fame" issue, also opened up about those annoying plastic surgery rumors.

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Could this be a new lip kit color? 😉 @kyliecosmetics

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"People don't realize I just turned 18, so there's no way my mom [Kris Jenner] would ever let me undergo a nose job or a boob job," she shared.