Kourtney Kardashian has shared the first photo of her third child with boyfriend Scott Disick; 4-month-old Reign Aston Disick.

Reign joins the couple’s older children; Mason, 5, and Penelope, 2. Reign and Mason share the same birthday, Dec. 14.

Kardashian posted the first photo of Reign to Instagram on Thursday, writing, “My little turtle dove angel baby boy Reign Aston Disick.”

Kardashian’s mom, Kris Jenner, reposted the photo and wrote, "Meet my beautiful grandson!!!! #blessed #oneofthelovesofmylife.”

The only other photo Kardashian has shared of Reign was a glimpse of his tiny hand right after she gave birth. She wrote at the time, “Madly in love.”

Disick has been having a difficult time lately, checking into a rehab center in Costa Rica recently. He has since checked out but said in a statement, “I realize my issues are bigger than me, and I’m ready to truly remedy this struggle I continue to battle.”

image via Instagram from Kourtney Kardashian

image courtesy of Mariotto/INFphoto.com