Katherine Heigl's Husband Josh Kelley Celebrates Birthday With 'Snuggles' From Newborn Son

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Josh Kelley was able to celebrate his 37th birthday with his newborn son and namesake, Joshua Kelley, Jr.

Katherine Heigl posted a pic on Instagram of her husband and baby boy sharing a snuggle on Monday night, and captioned it with a sweet message. "How @joshbkelley is finishing off his birthday, with sleepy snuggles from his namesake! Could not be more grateful for this extraordinary man and for this extraordinary day that he was born!" the 38-year-old actress gushed. "Happy Birthday to the sexiest, funniest, smartest, most talented, charming man I have ever met! Oh and he's not too shabby in the Dad department either...is there ANYTHING the man can not do??!!!"

WATCH: Katherine Heigl Shares First Photo of Son Joshua

Kelley also shared some pics from his birthday, including another image of him falling asleep with his son. "Mom caught us nappin on the job!!! #thejoshuas," he quipped.

The singer later shared a photo of his bicycle-themed birthday cake, with the caption: "Time to party ? people."

WATCH: Katherine Heigl on Giving Birth to Son Joshua -- 'I Actually Prefer the Adoption Way'

ET confirmed that Heigl and Kelley welcomed a son on Dec. 20, and joins older sisters Naleigh, 8, and Adalaide, 4, in the family of five.

Check out another adorable photo of the couple's newborn baby: