KYLIE Jenner has revealed the real reason she chose to plump up her pout - and it's all because of a teenage boy.
The Keeping Up With The Kardashians star revealed on the latest episode of her E! solo reality show she was left "insecure" after a crush made a dig at the size of her lips, The Sun reports.
Speaking to her therapist on Life of Kylie, she explained: "I was 15 and I was insecure about my lips.
"I had really small lips, and it was, like, one of my first kisses, and a guy was like, 'I didn't think you'd be a good kisser because you have such small lips'.
"I took that really hard."
The 20-year-old went on to say: "Just when a guy you like says that ... I don't know, it just really affected me.
"I didn't feel desirable or pretty."
Jenner added: "I really wanted big lips.
"I would overline my lips with the lip liner to create the illusion of bigger lips and then, finally, I was like, this lip liner isn't doing it and ended up getting my lips done.
"It sticks with you - it just got in there."
Rumours that Jenner - who has a best-selling lip liner range - had plumped her pout began back in 2014 but she initially brushed over doing anything to enhance her appearance.
In an interview with E! News that year, she said: "I feel like everyone has been talking about it for months, so I'm kind of sick of it.
"My pictures, I pout them out a lot.
"I think big lips are awesome."
However, by 2015, the star - then 17 - was ready to come clean.
In an episode of Keeping Up With The Kardashians, she confessed: "I have temporary lip fillers.
"It's just an insecurity of mine and it's what I wanted to do.
"Everyone always picks us apart.
"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."
Her decision didn't go down too well with mum Kris Jenner, who told Access Hollywood she was "really upset" by her daughter's decision to get fillers.
"I am thinking, 'Why? Why? Why do you need to do that?' and I got really upset," she said.
"And then it was done, and I had to let it go.
"She did it and I didn't really, you know, I wasn't completely supportive, believe me. But, you know, once that was done, you know, she's my kid.
"I love my kid. We make mistakes."
Jenner has since confessed she should have just been upfront about the fillers in the first place, as it was "so obvious" something was going on to make her lips larger.
She also advised anyone unhappy with their lips to be careful if they go down the filler path, as it's painful and tempting to get carried away.
"When you first get them done, you're like, 'Oh, it could be a little bit bigger on that side'," she told Complex.
"I'd go back and be like, 'They went down' and think they could be bigger.