Multiple sources confirmed the news to People magazine.
Page Six reported the whole Kardashian-Jenner family is "thrilled" to welcome another grandchild into the mix.
Caitlyn Jenner seemingly hinted at the news during an appearance at The Toy Store in Quincy, Calif., on Thursday. The former Olympian revealed one of her kids has a bun "in the oven," but didn't give confirmation on who it was.
The reality TV star already shares her three-year-old daughter Stormi with Scott. The rapper and the beauty mogul have been involved in an on-and-off-again relationship since 2017. The couple is reportedly not together at the moment.
The "Keeping Up With the Kardashians" star has previously talked about her plans to expand her family. Jenner admitted she wanted a lot more than just one child during an Instagram Live with Stassie Karanikolaou in April of 2020.
"I want seven kids down the line, but not right now," Jenner said during the Live, according to People magazine.
She added, "Pregnancy is just not a joke, it's a serious thing and it's hard. I'm not ready for that just yet."