Kourtney announced that their baby boy, born on Dec. 14, is Reign Aston Disick.
The Keeping Up with the Kardashians mother of three announced the news alongside a touching Instagram shot of herself holding little Reign's fingers.
“Madly in love with my little Reign Aston Disick,” Kourtney wrote.
The name Reign, which is English, means sovereign or ruler - perfect for a son of Disick, who, as reality TV fans know, calls himself “The Lord” after purchasing a title across the pond.
In an odd similarity, rapper Lil' Kim named her daughter Royal Reign in June.
Kourtney and Scott’s new bundle of joy arrived a week ago, on the same day as son Mason’s birthday (he turned 5).
The oldest Kardashian daughter, 35, and Scott Disick, 31, are also parents to daughter Penelope, 2.
Watch: Kourtney Kardashian Reveals She Is Having a Boy