Kylie Jenner gives birth to a baby girl

Kylie Jenner is officially a mom.

The 20-year-old reality star gave birth to her first child, a baby girl, on Thursday, according to messages that she shared on her social media accounts Sunday.

She also posted a YouTube video in a subsequent tweet showing the baby at the end with stats including that she was born at 4:43 p.m. and weighed 8 pounds, 9 ounces.

In scenes leading up to the baby's arrival, the parents-to-be, family and friends were shown at what appears to be a baby shower and at milestones along the way such as the 15-week ultrasound. Kylie's diet was a big part of the video story, as she ordered a well-done double cheeseburger and fries at a drive-through; at another gathering, she showed off a plate of two burgers, "one for me and one for baby."

Her mother, Kris Jenner, also shared the video in a tweet on Sunday about her joy over the new arrival to the family. "God is SO good!! I am so excited and thrilled to welcome another precious baby girl to our beautiful, ever growing family."

The father is Kylie's boyfriend Travis Scott, 25. Jenner began dating the Houston-born rapper last April.

Jenner grew up in front of the world on her family's E! reality show, Keeping Up With the Kardashians. The social-media maven has since spun off her own reality program, Life of Kylie, and a multimillion-dollar cosmetics business.

The youngest of the Kardashian clan kept exceptionally quiet about her pregnancy, never formally confirming she was expecting and keeping photos of herself off her Twitter and Instagram accounts until Sunday.

The Kardashian-Jenner family is in the middle of a baby boom. Khloe Kardashian, 33, recently confirmed her first pregnancy, and Kim Kardashian, 37, recently welcomed her third child with husband Kanye West via surrogate.

Contributing: Lorena Blas