Kourtney Kardashian delivers baby boy.

Kourtney Kardashian has added to her family a baby boy born on 14th December 2014 which co-incidentally is the 5th birthday of her first son, Mason.

Hours after the birth, she took time out to post a happy birthday message to Mason saying:  'Happy birthday to the coolest little boy in the entire world. You teach me so much every single day and changed my universe the second I met you. You have taught me what life is all about and I am truly blessed and honored to be your mommy.'

The whole family are reportedly over the moon with the new arrival.