Kim Kardashian and Kanye West have gone with a different surrogate to deliver their new baby -- but it ain't because they didn't like the last one ... she was simply unavailable.
Sources close to the couple tell TMZ ... Kim and Kanye hired a new woman to carry their fourth child, a boy ... not the 20-something-year-old they used last year for baby Chicago. The reason is simple ... that lady was already pregnant with a kid of her own.
We're told KK and KW's previous surrogate -- a young, healthy, fit woman in her 20s -- just gave birth to a daughter on Christmas Eve. Considering she'd just popped Chicago out less than 12 months prior, it's clear she and her husband of five years got busy quick.
BTW ... Kim and Kanye's first surrogate already has two boys of her own, so this is her third child.
No word on the profile of the Kardashian-Wests' new surrogate just yet, but ya gotta think she'll be comparable to the last one ... and Kim and Kanye will likely be just as involved during the pregnancy.
Kim and Kanye had one fertilised embryo left and decided they couldn't wait to have another child, so set about finding a new surrogate last year.
An insider told PEOPLE: "Kanye says that being a dad is the most important thing that he does, and despite his other problems, he’s an involved, loving dad to his kids."
In an October 2018 episode of Keeping Up With The Kardashians, Kim admitted her rapper husband had dreams of having a huge family.
She said: "Kanye wants to have more. He's been harassing me. He wants seven. He's stuck on seven. [Seven] crazy. I could never, especially in like the world we live in.
"I've been kinda hesitant about having more kids because it literally keeps me up at night, thinking about how my kids will survive in a crazy world like this."
In an interview last year, Kim admitted the best part of surrogacy was not having to breastfeed Chicago, meaning she could spend more time with her eldest children.
She said: "I would have maybe one more. I really, really enjoyed the surrogacy process. I will say, when it came to the breastfeeding time, I was like, 'Okay, this is the best decision I ever made.'
"It’s a game changer, having to not go through every few hours. I can spend so much more time with the older kids and getting them used to the baby."
No doubt fans will be wondering if the couple will hire an additional nanny to help care for their expanding brood.
Kim's former assistant Stephanie Shepard revealed in a 2017 interview that the couple had a nanny for each child when it was just North and Saint.
However, fans of the KUWTK will notice the nannies are never seen or mentioned on the reality show.