Kylie Jenner had lip fillers because she was convinced no one would want to kiss her.
The 'Keeping Up With the Kardashians' star - who is dating Tyga - was just 16 when she had injections to give her fuller lips and admits her small mouth has always been an "insecurity".
She said: "It has been an insecurity of mine all my life.
"This guy I kissed [in middle school] was like, 'Your lips are really small but you're a really good kisser. I didn't think you were gonna be good at kissing.
"It was so rude. From then on, I just felt like I saw guys staring at my lips. I felt like no one wanted to kiss me."
But the 19-year-old star admits she went too far with the treatments.
She told Complex magazine: "When you first get them done, you're like, 'Oh, it could be a little bit bigger on that side.' I'd go back and be like, 'They went down' and think they could be bigger. But I went too far. It was very painful."
Kylie initially denied having the treatments because she didn't want to be thought of as a bad role model.
She explained: "I wasn't even 17 yet.
"What if I came out and said, 'Oh, yeah, I got my lips done'? What are all those moms going to think about me? These kids, my fans, they're going to think I'm crazy. I didn't want to be a bad influence.
"I didn't want people to think you had to get your lips done to feel good about yourself. But they thought it was crazier that I was lying about it because it was so obvious. I wish I had just been honest and upfront."