"Happy Birthday to my sweet boys who forever changed my heart! I still can't believe they have the same birthday," Kardashian captioned the adorable photo, which shows Mason sitting on a couch hugging his younger brother (below).
But Kourtney isn't the only one in her family celebrating their special days. Over the weekend, younger sisters Kendall and Kylie Jenner celebrated their birthdays a bit early with a series of 'grams that proved they're the "cool aunts" in the family. And not to be outdone, Kim Kardashian shared a selfie of herself and Mason along with a sweet message today (below). "Happy Birthday Mason! You were the 1st born and changed everything! I can't believe you are 6 years old! I love you more than you can ever imagine!"
We have a feeling that these birthday wishes from their aunts are just the beginning!