Kourtney Kardashian Reacts After Her 14-Year-Old Son Mason Disick Joins Instagram

Kourtney Kardashian and Scott Disick's teenage son, Mason Disick, launched his official profile on Friday.

Kourtney Kardashian can't believe her teen is officially on the internet!

On Sunday, the Kardashians star reacted to her and Scott Disick's son, Mason Disick, launching his official Instagram account. 

"My first baby is on insta and I'm not ok @masondisick," the Poosh founder wrote with two sad face emojis over a picture of Mason's first post on the social site. 

On Friday, the 14-year-old shared his first few posts -- and they included some sweet moments with his siblings.

Kourtney Kardashian reacts to Mason Disick joining Instagram. - Kourtney Kardashian/Instagram

Mason's first post was a classic fit check. Presented without a caption, the teen showed off his black and grey fitted cap, which he paired with a black T-shirt and green cargo pants. 

The post garnered over 200,000 likes and some comments from his famous aunts. 

"I can't believe this is happening," Khloe Kardashian wrote.

"You're really on Instagram 🥹," Kim Kardashian added. 

Mason followed his post with a photo carousel featuring some of his friends and his 11-year-old sister, Penelope.

"fam," he wrote alongside the carousel of photos that shows him posing with friends, and then walking the New York City streets with his sister. 

On Saturday, Mason returned to the gram and shared a few more snapshots.

"🪞 pics is all we know," Kourtney and Scott's son wrote. 

Mason's posed alongside his brother Reign, 9, as they stood in a mirror. In the following pics, Mason mimicked the pics with a friend. 

So far, Mason is following in his famous family's footsteps and already has over 200k followers. 

Prior to his personal account, Mason has remained largely off both of his parents social media and the show Kardashians. In March, the teen appeared on social media when his aunt, Khloe, shared a rare moment with him during the family event. 

Without showing her nephew's face, Khloé labeled the video "Go offfff Mase," and called out Mason's polished look. 

"Fit check, Chrome, Chrome, show me the belt. Yes, Mason!" Khloé declared as she panned over Mason's long denim shorts and matching denim shirt, complete with Timberland boots, an elaborate silver belt and chain, and a series of chunky silver rings. "Let me see these rings. What is happening? Chrome, Chrome, Chrome!"

He finished off the look with a gold Rolex watch with a blue face.

In addition to Mason, Reign and Penelope, Kourtney is also the mother of Rocky Thirteen -- whom she welcomed with her husband, Travis Barker in November.