Kourtney Kardashian has given birth to a baby boy - on her son Mason's birthday.
The reality TV star and her husband Scott Disick welcomed their new arrival on December 14, as their eldest boy turned five.
"The family is freaking out with joy," a source told E! News. "What an amazing coincidence."
The couple also have a two-year-old daughter, Penelope.
Kourtney, 35, has yet to reveal details of her new son but did post a birthday message to Mason online.
She wrote on Instagram: "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 honoured to be your mommy."
Mason celebrated his big day with his Auntie Kim, sister Penelope and cousin North West, by going to Disney On Ice presents Let's Celebrate at the Staples Centre in LA.