The 19-year-old star took to her app to debunk reports claiming that she has gone under the knife.
"(I haven't had) ass implants. You know, I used to be 120 (pounds). I was really skinny. Now I'm pushing, like, 136. But it's all right, I like the chunkiness," Kylie said.
She also denied getting her face done and getting breast implants.
"People started saying that (when) I was, like, 16. You think Kris Jenner, at 16 years old, would let me get cheek and jaw reconstructive surgery? Nah. I always used to love my jaw - I never was self-conscious about my jaw.