Kourtney Kardashian's Son Mason Disick, 14, Joins Instagram, Shares Rare Photos of Himself All Grown Up

Kourtney Kardashian’s son Mason Disick has joined Instagram!

On Saturday, May 25, the 14-year-old — whom Kardashian shares with ex Scott Disick — launched his first official Instagram page as he shared rare photos of himself looking all grown up on the social media platform.

In his first post, Mason uploaded a photo of him posing outdoors on a balcony with his head dipped down while wearing a cap over his face, with a black T-shirt and khaki green baggy pants. In a second snap shared, he had his back turned to the camera as he showed off his outfit some more. 

Mason received emotional reactions from his aunts Khloé Kardashian and Kim Kardashian in the comment section as they responded to the photos.

“I can’t believe this is happening,” Khloé, 39, wrote as Kim, 43, added, “You’re really on Instagram 🥹.”

For his next post, which was captioned “Fam,” Mason shared a photo of him with a group of his friends as they each held Jaded London shopping bags while standing beside a white wall. 

In a second photo from that post, Mason walked the streets of Soho in New York City with his little sister Penelope Disick, 11, as they both wore furry coats with their backs turned to the camera. The siblings were also snapped in a third pic as they shared a sweet moment eating sweet treats together beside a brick wall. 

Lastly, Mason posted a joint bathroom selfie with his brother Reign Disick, 9, followed by photos of him posing with a couple of friends.

“🪞 pics is all we know,” the teenager wrote in the caption. 

On her Instagram Stories, Mason's aunt Khloé again shared her reaction to the teen joining Instagram.

"I can't believe my @masondisick is on insta. The one who named us KiKi and KoKo is a legit teenager," she wrote over the first photo Mason had shared on the platform, adding several emotional emoji.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human-interest stories. 

Mason is Kourtney’s eldest child shared with her ex Scott, followed by daughter Penelope and son Reign. The siblings also have their six-month-old baby brother Rocky Thirteen, Kourtney’s first child with her husband Travis Barker. 

Mason has followed in the footsteps of his social media savvy mom and aunts — who each have over 200 million followers and counting — in joining Instagram, along with the rest of his family in being on social media, and has already amassed 115k followers himself as of the morning of Sunday, May 26.