Baby makes five!
Kim confirmed on her website that the baby girl was born on Jan. 15 and weighed in at 7 lbs., 6oz.
"Kanye and I are happy to announce the arrival of our healthy, beautiful baby girl," the reality TV star wrote. "We are incredibly grateful to our surrogate who made our dreams come true with the greatest gift one could give and to our wonderful doctors and nurses for their special care. North and Saint are especially thrilled to welcome their baby sister."
Kim added, "We're so in love."
TMZ confirmed the news back in September that the powerhouse couple would be adding to their family thanks to a surrogate.
Kim had been vocal about wanting a third child but is unable to give birth again due to medical concerns that are so serious she could die if she were to get pregnant. She had also been vocal about finding a surrogate.
In July, Us Weekly reported that the couple's surrogate is a San Diego mom in her late 20s whom they found through a surrogate agency.
The couple are already parents to North, 4, and Saint, 2.
This won't be the last addition to the Kardashian clan this year -- both Kylie Jenner and Khloe Kardashian are reportedly due in the coming months.
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