Kim and Khloé Kardashian have shared their hilarious reactions to their little nephew, Mason Disick, finally joining Instagram after leaving fans in total shock.
The 14-year-old, who first entered the spotlight on Keeping Up With the Kardashians as just a little bub, has finally signed up to the social media platform - and it's making us all feel very old.
Mason Disick, the eldest of Kourtney's four children, officially joined the 'gram on Saturday (25 May) and - at the time of writing - has since racked up a staggering 395,000 followers.
If you're anything like me and can barely keep up with which of the multitude of Kardashian-Jenner kids belongs to which multi-millionaire parent, don't worry, we're here to give you a quick refresher.
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The Insta-newbie, aged 14, is the firstborn child of Kourt, 45 - who also happens to be the eldest of the iconic K-J brood - and her ex-husband Scott Disick, whom she dated between 2006 and 2015.
As well as Mason, the big-name couple also welcomed a daughter named Penelope, 11, and another son, Reign, nine, before finally ending their relationship following several on-off stints.
Fan-favourite socialite Scott, now 41, would often appear on his wife's family's hit series Keeping Up With The Kardashians, along with their three children.
Though the Disick children were barely out of nappies when they appeared on the legendary late Noughties show, fans of the family have followed their on and off-screen antics ever since.
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Featuring infrequently on the latest rendition of the show, Hulu's The Kardashians, Mason, Penelope and Reign regularly have viewers in stitches with their hilariously sassy and quick-witted remarks.
What many fans of the original Kardashian series may not realise, however, is exactly how much the eldest of the family's children have grown up during their time in the spotlight.
So much so, that a horde of followers have been left absolutely mind-blown this week after realising that eldest child Mason is actually a teenager.
After the 14-year-old set himself up with an Instagram account at the weekend - sharing his first three snaps - fans couldn't contain their shock at his milestone.
"Wdym Mason Disick has an IG page, I watched his birth. We’re getting old!" one fan tweeted.
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Another added: "Mason Disick is now on Instagram - yes, we’re all old asf."
While a third wrote: "I'm old asf bc WHYYYY does Mason Disick have an instagram acc."
And someone else claimed: "Mason Disick joining Instagram, I'm so old."
Apparently, however, it isn't just Mason's fans that have been left gagged at the prospect of the former TV baby joining social media as Kim and Khloé have also shared their thoughts.
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Commenting on her nephew's first pic, Kim, 43, wrote: "I can’t believe this is happening."
While Khloé, 39, added: "You’re really on Instagram."
Topics: Kim Kardashian, Khloe Kardashian, Parenting, Celebrity, Social Media, Instagram, Reality TV, TV And Film, Keeping Up With The Kardashians
Rhianna Benson