Just one day after the season premiere of Keeping up with the Kardashians, oldest sister Kourtney has delivered her baby.
PEOPLE reports: The reality star delivered son Mason Dash Disick on Monday morning at Cedars Sinai in Los Angeles, a source confirms to PEOPLE. The baby boy weighed in at 7 lbs., 6 oz., and measured 19.5 inches.
Heidi Montag also gave the new mama a shout out this morning, tweeting: heidimontag@KourtneyKardash CONGRATS on the birth of your Baby Boy !! Sending our lov to you and Scott and your whole Family !!! What a blessing !!!
No photos have surfaced of the new baby yet.












Comments