"Kourtney just delivered a healthy baby boy about an hour ago," her publicist told E! News on Monday morning.
Kardashian announced she was pregnant in August and the family threw her a baby shower last month at Kris and Bruce Jenner's house in Calabasas.
On Thursday, Khloe and Kim Kardashian told Ryan Seacrest on his KISS-FM radio show that their sister was "due any minute."
Keeping Up With the Kardashians' fourth season premiered last night on E! and featured Kourtney's family members -- especially Kris and Khloe -- vocally expressing their concern about Disick becoming a part of the family as the father of her baby.
(Photo credit E!)
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