TMZ reported the 20-year-old started telling friends earlier this month, with her boyfriend of five-months, rapper Travis Scott, apparently telling friends that they're expecting a girl.
Another source close to the famous couple told People: “It is an unexpected but completely amazing turn of events that she could not be more excited or thrilled about.”
Though no one in the Kardashian-Jenner family has addressed the news, Kylie took to Instagram overnight to share a photo showing her tummy - and potential baby bump.
Posing with her friend Jordyn, Kylie placed her hand on her stomach, lifting her baggy jumper slightly.
While it's too hard to tell whether there's a bump there or not, one thing's for sure: Kylie is totally aware of how confusing the photo is.
The star also posted a mirror selfie with friends while wearing a white bathrobe - again, covering her tummy in all the right places.
Now to wait for official confirmation (or not) from the Kardashian family...