Kim Kardashian Watch Your Back: Half-Sister Kylie Jenner Debuts 'Amplified' Rear

Kylie Jenner's is just about half her sister Kim Kardashian's age but she already has a rear that can give Kim a run for her money.

That Jenner's ample backside is more than genes is the talk doing the rounds, given that the 17-year old made her chest go from modest to busty and sprouted a pout overnight, in the past. Also being mama Kris Jenner's daughter doesn't help. Though the Jenner girl then denied going under the knife, the before and after pictures did not convince anyone. Recently posted pictures to her Instagram, show Kylie with a visibly enlarged and a more womanly derriere.

Hollywood Life talks of butt injections and the youngest Jenner is reportedly very happy with the change. Her boyfriend Tyga is awed with Jenner's curves.

"Kylie's always wanted a butt to match her sister's. She's thrilled with the results and isn't holding back from showing it off," a source was quoted saying.

However, unlike older sister Kim who has spoken about plastic surgery, Kylie is in denial.

"I haven't had plastic surgery. I've never been under the knife. People flashback to pictures of me when I was 12 and say 'Kylie's so different' but how can I look the same from 12 -18?"