US Weekly reported back in August that the Wests, who used a surrogate for 11-month-old daughter Chicago, had one embryo left, which was male.
They have now confirmed that the final embryo has been implanted, and the couple should expect their second son in “very early May.”
In addition to Chicago, the rapper and socialite share daughter, North, 5; and son Saint, 3.
The news comes just hours after Kobe Bryant announced that he and wife Vanessa are also be expecting their fourth child.
“Vanessa and I are beyond excited to announce that we are expecting another #mambacita to go along with Natalia, Gianna and Bianka,” the former Laker captioned his post.