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Meet Reign Aston Disick.

Reality star mama Kourtney Kardashian introduced her 3-month-old son via Instagram Thursday. “My little turtle dove angel baby Reign Aston Disick,” the mom-of-three, 35, captioned the photo of her beautiful baby boy dressed in a white one-piece.

Kardashian and longtime love Scott Disick welcomed their third child on December 14. The couple are also parents to daughter Penelope Scotland, 2½, and son Mason Dash, 5 (also born on Dec. 14).

The sweet baby boy also joins big cousin North West, nearly 2.

My little turtle dove angel baby boy Reign Aston Disick.

A photo posted by Kourtney Kardashian (@kourtneykardash) on Apr 2, 2015 at 10:00am PDT