The Kardashians

Kourtney Kardashian’s Son Mason Throughout the Years — See How Much He’s Grown Up! (PHOTOS)

Believe it or not, it's been four years since Kourtney Kardashian reached down and pulled her son Mason Dash Disick out during labor — a visual that no one will soon forget. Now, that same little baby who was born on December 14, 2009, is 4 years old — and he's quite the adorable big brother to 1-year-old Penelope.

Mason, who we think looks just like his daddy Scott, is one of the most stylish famous tots in Hollywood. After all, his mommy has several clothing collections and fragrances, and also co-owns the D-A-S-H clothing boutiques, so it's no wonder that Mason is such a mini trendsetter.

Kourtney's little guy has done some pretty cool stuff over the past four years, like going ice skating at Disney on Ice, checking out Disneyland with his mom and sister, going to movie screenings, and more.

Click through the gallery to see photos of Mason through the years. Isn't he the cutest? Sound off in the comments!