Kourtney Kardashian and Baby Penelope Celebrate Mason’s 3rd Birthday! (PHOTOS)

It was a fun-filled birthday for Mason Disick who turned 3 on Friday, December 14!

After paying a visit to the Miami zoo and the Gold Coast Railroad Museum, Mason partied it up with friends at Serendipity 3 in Miami Beach. Everyone was on hand for the 3-year-old’s big day, including aunts Khloe and Kim, papa Scott, Jonathan Cheban, and adorably baby Penelope!