The 20-year-old reality star welcomed her first child with Travis Scott on Feb. 1, she announced on Instagram on Sunday. Jenner gave birth to a "beautiful and healthy baby girl," and explained why she chose to keep her pregnancy journey private.
"I've never felt love and happiness like this I could burst," she also wrote about being a new mom.
She also shared an intimate video of how she's spent the past nine months.
A source told ET last month that the reason Kylie, who never confirmed the pregnancy on her own, has been MIA from the spotlight for the past few months is because she wanted to spend some well-deserved time to herself ahead of the baby's arrival.
"[Kylie's] worked hard her entire life, and being a mother will be a lot of work, so now is a chance for her to recharge," the source said.
An additional source told us that Kylie plans to live an even "quieter life" now that she's a mom.
"Kylie is a homebody, and enjoys everyone often coming to her house," the source explained. "When the sisters aren't together, they still stay in contact regularly with their family text thread. Kylie is enjoying the time with her family and close friends. Kylie keeps a small personal circle, and they have all been there for her during this time."
ET confirmed last September that Jenner was expecting a child with Travis. "Kylie always wanted to be a young mom," a source told ET at the time. "She may be young, but she's very maternal and has lots of practice with babies!"
It's an exciting year for the Kardashian-Jenner family. In addition to Kylie's baby, Khloe Kardashian is also expecting her first child with her boyfriend, Tristan Thompson.
The news comes just a few weeks after Kim Kardashian West and her husband, Kanye West, welcomed their third child, baby girl Chicago "Chi" West.