The Kar-Jenner clan were out in force on Tuesday to mark the 44th birthday of the eldest sibling Kourtney Kardashian.
With loving words a plenty and throwback snaps at the ready, fans of the famous family were loving a trip down memory lane.
But it was the matriarch of the family Kris Jenner 's post that really got people talking.
With a backing tune of 'My Girl' by The Temptations, the 67-year-old shared a selection of old videos from her eldest daughter's childhood.
And a number of the shots saw fans have to take a double take in what they thought showed the double of Kim Kardashian's daughter North, 9.
In the comments section of Kris' Instagram post, one user wrote: "I’m realizing how North is Kourtney’s twin for sure," while a second agreed, saying: "She looks like North' twin."
A third also joked: "Not young Kourtney looking exactly like North," while a host of others shared very similar remarks.
The video kicked off on Kris' Instagram, fans watched her and her late husband Robert Kardashian bring home baby Kourt aged just days old.
It then showed a montage of the POOSH founder growing up with her siblings before moving on to show off her and her own kids, Mason, 13, Penelope, 10, and Reign, 7.
The final scenes showed Kourtney on her wedding day as she tied the knot with Blink-182's Travis Barker in Portofino last year.
Kris gushed over the "incredible milestone" of welcoming her firstborn in the lengthy caption for the upload.
She ended by saying: "I thank God he chose me to be your mommy and I love you more than you will ever know."
Kourtney took the time to send the love back in her mum's direction, penning in the comments section: "I love you mommy."
A number of other family members shared sweet messages to mark Kourt's special day. Khloe Kardashian gushed she has "loved you before even knowing how to love" in her emotional upload, while hubby Travis shared an expectedly full-on post.
In his tribute to his wife, the drummer shared a number of PDA-filled images before calling his belle his "soulmate".
"Happy birthday to the most beautiful amazing woman to walk the face of the earth. I love you, my wife," he proudly penned.
