The reality TV star and her on/off boyfriend Scott Disick welcomed 7lbs 6oz son Mason Dash Disick into the world on Monday (14.12.09) and both mother and baby are doing well.
A publicist for the first time mother said: "Kourtney just delivered a healthy baby boy about an hour ago."
Soon after the birth at a Los Angeles hospital Kourtney sent sister Kim out to get a her tuna sandwich from popular Beverly Hills deli Nate 'n Al.
Kourtney, 30, revealed she was expecting a son in October, saying: "Scott and I are thrilled to add a little boy to the bunch. A boy is definitely needed in this family!"
Kourtney announced she was pregnant in August after discovering she was expecting after filming a new reality TV show with her other sister Khloe.
She said: "We were in the Everglades and I kept feeling nauseous and sick and I just kept thinking, like, something wasn't feeling right. I've never missed a period in my life."?