Mason Disick Looks So Grown Up in Rare Family Photo

Kourtney Kardashian and Scott Disick's 13-year-old son Mason made a rare appearance on social media in a sweet family photo shared by Kim Kardashian.

Even if you've been keeping up, this pic might still catch you by surprise.

After all, Kim Kardashian recently shared family photos, and featured in the carousel was Kourtney Kardashian and Scott Disick's 13-year-old son Mason Disick, marking a rare sighting for the teenager.

In the photos, Mason holds up a peace sign while his dad drapes an arm around him. Also posing with the pair? Mason's sister Penelope Disick, 11, as well as cousins North West, 10, Saint West, 8, Chicago West, 5, and Psalm West, 4.

Kim simply captioned the Dec. 11 post, "Everything."

And her followers agreed, with many stunned at how grown up Mason looked. "Shut UP. why does mason look 17," commented one user, while another added, "Omg WE HAVENT SEEN MASON IN FOREVERRRRRRRRRRR!!!!! Our little internet nephew GREW UP!!!!!!!!!!!!"

But while he might be the internet's nephew, Mason also plays an important role in his IRL family: big brother. A role that became that much more important when Kourtney gave birth to her and Travis Barker's first child, Rocky Thirteen, in November. 

Indeed, baby Rocky joined a large, blended family. In addition to counting Penelope as his sibling, Mason also is big brother to Reign Disick, 8. Plus, Travis is dad to Landon Barker, 20, Alabama Barker, 17 (with ex-wife Shanna Moakler) and stepdad to Atiana De La Hoya, 24.  

It's a concept that has always appealed to the Poosh Founder, who tied the knot with the Blink-182 drummer in 2022. 

"I love the idea of a blended family," Kourtney said during a confessional on season two of The Kardashians. "I think the more kids the merrier. You have all these siblings and more people to love, and it's a beautiful thing."

Keep reading for more of the Kardashian-Barker family's best moments. 

Kourtney and Travis took Alabama to Tommy Factory's New York Fashion Week show in September 2022.

Penelope Disick—who Kourtney and ex Scott Disick share alongside sons Mason Disick and Reign Disick—appeared with her mother in a vacation selfie from Australia.

Reign and Penelope enjoyed some fun in the sun during their family trip to Australia for Blink-182's tour.

Kourtney and Travis enjoyed some touristy activities in Australia.

In honor of Landon's 20th birthday in October 2023, Kourtney shared a throwback photo from 2017 of the then-teenager hanging out with Mason.

Alabama snaped a silly selfie with half-sister Atiana, as well as Kourtney and Penelope, during the Kardashians star's May 2022 wedding with Travis.

Kourtney took a break from her wedding festivities in to pose for a selfie with Alabama in May 2022.

Travis took Alabama, Landon and Atiana to the premiere of The Kardashians in April 2022. Meanwhile, Kourtney was joined by Reign.

Kourtney's oldest son Mason tagged along with Alabama and Atiana to Travis and Kourtney's front row outing at the AMIRI fashion show in February 2022.

Kourtney Kardashian and Travis Barker was joined by Landon Barker—who he and ex Shanna Moakler share alongside daughter Alabama Barker and stepdaughter Atiana De La Hoya—at GQ's Men of the Year party in November 2022.

Kourtney shared a close up of this sweet throwback of Alabama and Penelope for Alabama's 17th birthday.

Kourtney, Travis, Alabama, Atiana, Landon and Reign posed at Disneyland in April 2022. 

The group spent the day at the Happiest Place on Earth in honor of Kourtney's 43rd birthday.

Landon, Atiana and Kourtney bonded over a fun snapshot.

Penelope the artist! Travis shared her drawing of him in March 2022.

On Christmas Eve 2021, the Kardashian-Jenners joined the Barkers for a night of celebrations.

Travis and Penelope enjoy a game of checkers, while Kourtney and matriarch MJ Houghton watch the pair.

For Alabama's 16th birthday in December 2021, Kourtney and Travis surprised her with balloons that spelled out "BAMA 16."

Travis wrote in caption, "I LOVE YOU SO MUCH!!!"

Travis appeared with Kourtney and Penelope in a TikTok video posted on the mom-and-daughter duo's joint account.

"So happy for you guys," Travis' daughter Alabama wrote on a photo celebrating the couple's engagement. "I love u both!"

Landon joined his dad and Kourtney for some Halloween 2021 fun at Knott's Scary Farm in Southern California.

Kourtney recruited her son Mason for a trip to Universal Studios' Halloween Horror Nights with Travis and his daughter Alabama in 2022.

Atiana posed as the Bride of Frankenstein to Reign's Frankenstein during the spooky outing.

Kourtney's daughter Penelope rocked a devil costume as the crew headed to the Los Angeles immersive jack-o-lantern experience Nights of the Jack.

During their Nights of the Jack adventure, Alabama captured Travis and Penelope sharing a sweet moment as he walked around carrying her on his shoulders.

Even before they were dating, Travis and Kourtney were friends for years. Just look at this throwback photo of Mason, Landon, Alabama and Penelope from 2017.

Talk about a sweet birthday present! Travis gifted Kourtney's daughter Penelope a state-of-the-art drum set when she turned nine back in July 2021.

What better place to spend the Fourth of July 2021 than Disneyland? The happy couple celebrated the holiday there with Landon, Alabama and Reign.

Atiana opted to twin with Kourtney in matching snow gear during their first family trip together in Deer Valley, Utah, in April 2021.

Who needs to hit the slopes when you've got snowmobiles? Alabama joined in on the fun in this candid snap of her, Kourtney and Atiana.

For the latest breaking news updates, click here to download the E! News App