Karl Stefanovic's son looks exactly like... Karl Stefanovic's brother.

There’s definitely a resemblance there.

Quick-witted king of breakfast television Karl Stefanovic shared a rare emotional moment online yesterday.

Posting a photo of himself alongside teenaged son Jackson to Instagram, the Today show host wrote: “My little bloke not so little. Off to the school formal. Daddy crying.”

The sweet sentiment drew more than 6,000 likes in just a few hours, and was deemed “cute” and “adorable” by a few of Karl’s many online fans.

But for the most part, commenters on the photo seemed to want to talk about one thing, and one thing only: Jackson’s striking resemblance to his uncle Peter.

My little bloke not so little. Off to the school formal. Daddy crying. @jackson_stefanovic

A photo posted by kstefanovic (@kstefanovic) on Nov 5, 2015 at 10:25pm PST

“Wow he looks like Pete,” wrote karinaleonello.

“Wow, a blonde Uncle Pete!” agreed yogabel22.

“Thanks for Uncle Petes Genes DAD,” weighed in robynemwilliams.

One or two commenters bravely suggested 16-year-old Jackson looked like his father — “Awwww what a cutie. Looks like his daddy,” wrote karenmatthews70 — but others quickly set them straight.

“He looks more like PETE,” wrote lcalcutt9.

“Two peas in a pod, so much uncle Pete…thats not a bad thing,” agreed just_add_ice.

If you’re wondering what all the fuss is about, here’s a photo of Karl’s young brother Peter — also a television journalist — for comparison:

And here’s an image of the two together.

As this photographic evidence makes clear, a fondness for pink run in the family — so it’s no wonder Jackson could be mistaken for either of them in his salmon-coloured formal tie:  

  Happy 16 th to my beautiful eldest. Daddy loves you @jackson_stefanovic hahahaha   A photo posted by kstefanovic (@kstefanovic) on Aug 27, 2015 at 3:35pm PDT

Jackson also shares Peter’s thick hair and slim nose, although all three Stefanovic men ave similar eyes and cheeky smiles.

Me and my mate A photo posted by Peter Stefanovic (@peter_stefanovic) on Feb 7, 2015 at 5:02pm PST

Jackson, who turned 16 in August, is the oldest of 41-year-old Karl’s three children with wife Cassandra Thornburn: The two youngest are seven-year-old River and nine-year-old Ava.

Both Karl and 28-year-old Peter — who is dating Karl’s Today show co-host Sylia Jeffreys — intermittently post photos of Karl’s kids on Instagram.

Here’s my little mate @jackson_stefanovic shredding to sweet child o mine. While big poppa @kstefanovic cheers on…

A photo posted by Peter Stefanovic (@peter_stefanovic) on Dec 4, 2014 at 11:17pm PST

More of Karl Stefanovic’s Instagram: