"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," Jenner captioned a slideshow.
"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! Can't wait to celebrate with you guys!" Kim wrote on her own account.
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Disick is parent to Mason, Reign and 6-year-old daughter Penelope with Kardashian.
Kardashian shared a photo of herself lounging in bed with Disick last week while co-parenting their daughter.
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