Kim Kardashian and Kanye West have welcomed a baby boy via surrogate. The child joins 6-year-old North, 3-year-old Saint, and 1-year-old Chicago - who was also born through surrogate.

The mother-of-four took to twitter to announce the news. "He's here and he's perfect," she wrote.

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"He’s also Chicago’s twin lol I’m sure he will change a lot but now he looks just like her," she later added.

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While Kim has repeatedly spoken about how much she loves being a mother, back in August, a Keeping Up with the Kardashians source told the publication that the reality star and her rapper husband weren't "in a huge rush" to have a fourth child.

"They have absolutely talked about trying for another baby with the help of a surrogate, but nothing seems decided for sure," claimed the insider, before pointing out "Chicago is still little, and they have time."

Watch Kris Jenner find out that Kim's surrogate has gone into labour:

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In the past, Kim has said that while she's open to having a fourth child, it's a decision that she and Kanye will make privately, and at the right time. "My home and my heart feel really full right now, in the best way," she said, before stating that a fourth baby would definitely be the last. "I don't think I could handle more than that. My time is spread really thin. And I think it's important that in all couples, the mum gives the husband as much attention as the kids."

Congrats on the kiddo, Kim and Kanye!

Kim and Kanye officially welcome baby boy