Kris Jenner has revealed that she helped to deliver her granddaughter Stormi, praising how much of a "trouper" Kylie was while giving birth.

In a teaser for the next episode of Keeping Up With The Kardashians, Kris said she was "really excited" to be so involved in the birth of her youngest daughter's first child.

"She (Kylie) did really, really well. She just kept saying, 'I just don't feel any pain.' You'd see these contractions like crazy and she would go, 'I just am not feeling it.' I'm like, 'This is really weird!'" Kris said.

"She was such a trouper. She really was. She was so calm. It was really exciting. I delivered the baby! I delivered her. I pulled her out."

Kylie and boyfriend Travis Scott chose to keep her pregnancy a secret until after Stormi was born 7 months ago, with the reality star and businesswoman saying it was one journey that she didn't want to share with the world.

"I'm sorry for keeping you in the dark through all the assumptions. I understand you're used to me bringing you along on all my journeys," Kylie said on Instagram after Stormi's birth.

"My pregnancy was one I chose not to do in front of the world. I knew for myself I needed to prepare for this role of a lifetime in the most positive, stress free and health way I knew how. There was no gotcha moment, no big paid reveal I had planned. I knew my baby would feel every stress and every emotion so I chose to do it this way for my little life and our happiness.

"Pregnancy has been the most beautiful, empowering and life changing experience I've had in my entire life and I'm actually going to miss it. I appreciate my friends and especially my family for helping me make this special moment as private as we could.

"My beautiful and healthy baby girl arrived February 1st and I just couldn't wait to share this blessing. I've never felt love and happiness like this I could burst. Thank you for understanding."