Kylie Jenner, she of 107 million Instagram followers, was once deeply insecure about the size of her lips. Now she's taken that insecurity and turned it into a multimillion-dollar beauty brand.

In an interview with London's Evening Standard, the 20-year-old chatted with her older sister Kim Kardashian about makeup, motherhood, and what really inspired her journey with Kylie Cosmetics.

"It’s the most authentic thing I’ve done in my career, and it really relates to me, and I feel like people can tell that I’m superpassionate about it," said Kylie when Kim asked about the secret to her success. "It came from an insecurity, and I turned it into something. I was insecure about my lips, and lipstick is what helped me feel confident. And I feel like people could see that it’s authentic to me, and it was organic, and it just worked!"

In 2017, Kylie opened up for the first time about her decision to get lip injections—something that had been the subject of longtime speculation: “I was 15, and I was insecure about my lips," she confessed during an episode of Life of Kylie. "I have really small lips. And it was, like, one of my first kisses, and a guy was like, ‘I didn’t think you would be a good kisser because you have such small lips.’ But I took that really hard. Just, when a guy you like says that, I don’t know, it just really affected me. I just didn’t feel desirable or pretty. I really wanted bigger lips. I would overline my lips with lip liner just to create the illusion of bigger lips. And then, finally, I was like, 'This lip liner isn’t doing it.' [I] ended up getting my lips done."

Now her $29 lip kits allow makeup lovers to achieve their desired look sans fillers. As for her thoughts on plastic surgery in general, Kylie says that she's all for it—but emphasizes that she would only go under the knife on her own terms. "I feel like if it makes you feel better, and if that’s what you want to do, I’m not against it," she said in the interview. "Right now, I probably wouldn’t do anything, actually."

Related: Kylie Jenner Isn't to Blame for the Rise in Lip Injections, Says a Park Avenue Plastic Surgeon