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 posted on her social media accounts Sunday.

She also posted a YouTube video in a subsequent tweet showing the baby.

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A post shared by Kylie (@kyliejenner) on

And her mother, Kris 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 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 multi-million 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.

Meanwhile, 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 via surrogate.