Kourtney Kardashians sons Mason and Reign might be five years apart, but they share the same birthday on 14 December.
Naturally the famous family flocked to social media to mark the day as Mason turned nine and Reign turned four.
Leading the charge was their dad Scott Disick, who let the picture do all the talking on Instagram.
Sharing a touching image of the boys cuddling while speeding along on a boat, the proud dad added: Happy birthday my loves!
Happy birthday to our beautiful boys, Mason and Reign! It brings me so much joy to watch you grow. You are the greatest blessings in our lives and I love you so much. Happy birthday pic.twitter.com/gE4vVD0SUZ
— Kris Jenner (@KrisJenner) December 14, 2018
Meanwhile, the birthday boys grandmother Kris took to Twitter to celebrate the big day with a selection of snaps that are just too cute to handle.
Happy birthday to our beautiful boys, Mason and Reign! It brings me so much joy to watch you grow, the 63-year-old momager wrote.
You are the greatest blessings in our lives and I love you so much. Happy birthday!
My two nephews born on the same day!!!! Mason & Reign I love you to the moon and back! Watching you grow up has been the best journey ever! Cant wait to celebrate with you guys! pic.twitter.com/jl0PkdgbPl
— Kim Kardashian West (@KimKardashian) December 14, 2018
Kim, whose three-year-old son Saint also recently celebrated a birthday, took to the the microblogging site as well to commemorate Mason and Reigns shared birthday.
My two nephews born on the same day!!!! Mason & Reign I love you to the moon and back, the make-up mogul gushed to her 59 million followers.
Watching you grow up has been the best journey ever! Cant wait to celebrate with you guys!
Khloe was also full of birthday love as she shared a video of Mason opening a card on her Instagram story.
Happy birthday! Auntie Koko squealed in the clip as a shy-looking Mason smiled reluctantly towards the camera.
Oh my goodness, you cant tell me no because its your birthday!
Khlo then shared a snap of her birthday message to the nine-year-old, in which she gushed: Happy birthday to one of the coolest people I know.
You are one of my most favorite people in the world! I love you as much as you love Fortnite! Auntie KoKo.
The Revenge Body host, who welcomed her own daughter True back in April, also posted a series of adorable throwback snaps of Mason and Reign, adding: Happy Birthday Mase and Reign!!! I love how our family has grown.
I love how amazing you both are! We are so lucky to have the both of you!! Until the end of time, I love you!
Happy birthday guys!
And can you all stop growing now? Thanks.
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