Kim and Kanye are expecting their fourth child together via surrogate, People reported.
The couple's newborn will join big siblings Chicago, 11 months, Saint, 3, and North, 5.
The news may come as a surprise to fans since a Keeping Up with the Kardashians insider told the magazine in August that Kim, 38, and Kanye, 41, weren't "in a huge rush" to have another baby.
"They have absolutely talked about trying for another baby with the help of a surrogate, but nothing seems decided for sure," said the insider. "Chicago is still little, and they have time."
Chicago is the couple's only child thus far to be born via gestational surrogate.
"They would use the same surrogate if she agrees to help them again. Kim can't say enough kind words about the surrogate," added the insider.
A second source told People, "Kim and Kanye were already talking about baby No. 4 when Chicago was just a couple of days old. And they absolutely would use the surrogate again. They love her."
That same month, Kim told E! News she and her rapper husband weren't sure whether they were ready to welcome a fourth child into their family.
"I don't know... But I've been really open about it and talked about it on our show... so if I think about it more and it's going to happen, you'll definitely see it on the show. But as of now, no," Kim said at the time.
But Kim reportedly had a wonderful experience with the surrogate she had hired, especially when taking into account all of the free time she had since she could not breastfeed.
Kim felt it was necessary to work with a surrogate for Baby No. 3 because she had been told by doctors it would be too dangerous for her to conceive and attempt to carry another child after North and Saint.
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The reality TV star underwent two surgeries after delivering North in order to have her second child. She suffered from placenta accreta -- a condition in which the placenta stays attached to the inside of the uterus -- both times.
She had explained to her family that the operation was designed to repair her uterus and remove scar tissue, but there were complications during the procedure and it didn't work out as planned.
"[I feel] surrogacy is the only option for me," Kim said at the time. "I'm definitely leaning towards I want to try [surrogacy]. I always knew surrogacy was an option, now it's my reality. Whatever is meant to be will be."