There's one more Kardashian for fans to keep up with. Kourtney Kardashian and her longtime boyfriend Scott Disick welcomed their new son into the world on Sunday ... on their son Mason's 5th birthday! A source says, "The family is freaking out with joy. What an amazing coincidence."
The new baby boy is their third child together, and is now a little brother to Mason and daughter Penelope -- who is 2 years old.
Meanwhile on top of getting a new little brother for his birthday, Mason was treated to a 5th birthday surprise from Aunt Kim! The 5-year-old, his sister Penelope, and cousin North all enjoyed "Disney On Ice."
