Kourtney Kardashian just gave her son a pretty great birthday gift: a little brother!
The new baby also joins big sister Penelope Scotland, 2.
“It’s going to be perfect for our family,” she said.
As for Mason, he still got a special birthday celebration. His famous family, including aunts Khloé Kardashian and Kendall Jenner, threw him an early Nightmare Before Christmas-themed bash in November.