The "Keeping Up with the Kardashians" star took to social media on Friday to share their baby boy's moniker with a screenshot of a text message from the "Yeezy" rapper.
"Beautiful Mother’s Day With the arrival of our fourth child,” Kanye, 41, wrote. "We are blessed beyond measure We have everything we need.”
The message also showed a sweet photo of the family's newest addition sleeping in a bassinet.
Kim and Kanye welcomed their son via surrogate last week.
"He’s here and he’s perfect!" the KKW Beauty mogul confirmed on Twitter at the time. "He’s also Chicago’s twin lol I’m sure he will change a lot but now he looks just like her," she added.
The pair — who wed in 2014 — are already parents to North, 5, Saint, 3 and Chicago, 18 months.