"I needed to prepare for this role of a lifetime in the most positive, stress free, and healthy way I knew how," the 20-year-old wrote.
"Pregnancy has been the most beautiful, empowering, and life-changing experience I've had in my entire life," she continued, before revealing she gave birth to a "healthy baby girl" on February 1st.
Though no name has yet been revealed for Kylie and Travis Scott's new addition, apparently the first days of motherhood have been "the happiest of [Kylie's] life."
"She feels like being a mum is her true calling and there's nothing that's ever felt so right," a source revealed to E!.
"Bringing the baby home has been the greatest joy and most sacred experience, she is elated and overjoyed," they continued.
"Kylie felt so ready to meet the baby and had been counting down the weeks for what felt like forever, she can't believe she's finally here and in her arms and this journey is beginning."
Congrats to the happy family!
Take a look at Kylie's pregnancy video below.