Kylie Jenner gave birth to a baby at the tender age of 20. (Photo: Hayu)

Kylie Jenner has given birth to a baby girl. She said as much on Instagram, but what timing–right during the Super Bowl! The baby, however, was actually born on Thursday, Kylie reveals with an apology to her fans.

“I’m sorry for keeping you in the dark through all the assumptions,” she wrote.

“I understand you’re used to me bringing you along on all my journeys. My pregnancy was one I chose not to do in front of the world,” she added.

“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.”

She got that right. Kylie, like sisters Khloe Kardashian and Kourtney Kardashian, is an unwed mother.

She also just turned 20, which is stupidly young to be having a baby. She’s still a baby.

“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,” she explained.

She also offered this advice:

“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.”

The 20-year-old star also shared an 11 minute video montage on YouTube with clips from the last nine months as well as throwback videos from when her mother Kris Jenner welcomed her into the world.

She also showed off the bond she shares with half-sisters, Kourtney, Khloe and Kim Kardashian and sister Kendall Jenner.