20-year-old Kylie Jenner and boyfriend Travis Scott welcomed a healthy, baby girl on February 1.
Kylie and Travis, 25, have been dating since early 2017 after the makeup mogul broke up with her on-again, off-again boyfriend Tyga in April.
Kylie made the annoncement via Instagram.
She also posted an 11-minute video about what's been going on for the last nine months:
A source told People that Travis began telling friends about it in July: "He was so excited he couldn't keep it in. He's been so affectionate and protective of Kylie since they found out. He can't wait to be a dad."
The Kardashians and the rest of the Jenners are also very supportive of Kylie's relationship with Travis. An insider spilled, "He treats Kylie with a lot of respect and love. Kylie is very happy."