In an cool coincidence, the baby was born on exactly the same day that their other son, Mason, was born. Talk about an awesome birthday gift!
The reality star has not yet revealed her son's name, but she might still be trying to pick one as she revealed to E! News back in October that she was totally stuck on name selection. "I want to wait until the baby is born," she said.
While sister Kim Kardashian didn't exactly have an easy pregnancy, Kourtney has enjoyed the maternity phase much more.
"I love being pregnant in general," she told Fit Pregnancy in her December/January cover issue. "This time I'm more tired than I was the other times. I think it's because I'm always running around and working on different things."
"But I feel comfortable with how I look and feel," she continued. "I find a pregnant body to be beautiful and an incredible reminder of what a woman's body is made to do."
This is the third child for Kourtney and Scott who are also parents to son Mason, 5, and daughter Penelope, 2.
Congrats to the whole family!
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Gallery | Celebrity Babies