Kourtney Kardashian Welcomes Third Child

15/12/2014 12:19 | Updated 20 May 2015

Kourtney Kardashian and Scott Disick just gave their son Mason the best birthday present - a baby brother!

Scott Disick and Kourtney Kardashian

The couple, who are also parents to two-year-old Penelope, welcomed their third child together on Sunday, the same day that Mason turned five.

"The family is freaking out with joy," a source told E! News. "What an amazing coincidence."

There are no details on the new arrival's name just yet. In October, Kourtney told E! she had "some ideas" but she was waiting to meet him first.

"I want to wait until the baby is born," she added.

On Sunday morning, Kourtney took to Instagram to share a picture of her baby's crib.

Suggest a correction