Katherine Heigl welcomes baby boy with husband Josh Kelley

Congrats to Katherine Heigl and husband Josh Kelley on welcoming their third child!

ET can confirm that cute couple have welcomed a son, who joins older sisters Naleigh, 8, and Adalaide, 4, in the family of five. People reports that the baby boy is named Joshua Bishop Kelley Jr. and was born on Dec. 20.

RELATED: Katherine Heigl and Josh Kelley Celebrate Holiday-Themed Baby Shower Ahead of Baby No. 3's Christmas Arrival!

The couple prepared for their son's arrival with a mountain-themed baby shower in early December.

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"The Christmas holidays are a pretty big deal in my family and not only will we now be celebrating our baby's birthday around Christmas, Josh and I also celebrate our wedding anniversary December 23rd," Heigl shared on her blog, Those Heavenly Days. "So it's a month full of joy and gratitude for us for many reasons!"

WATCH: Katherine Heigl's Daughters Help Dad Josh Kelley Write a Song on the Piano

The actress opened up to ET last fall about blaming her forthcoming baby boy for her pregnancy cravings for sweets, saying, "It's lovely actually because I feel absolutely no responsibility for my behavior at all. It's great."

"If I'm not on set, I don't think about them that much. And I don't eat them because they're not around," Heigl explained on the set of her new legal drama, Doubt, back in September. "But on set, crafty always has a plethora of donuts in really pretty pink boxes and I can't stop thinking about them."

See more in the video below.

EXCLUSIVE: Katherine Heigl Talks Pregnancy Cravings and Hiding Her Baby Bump on 'Doubt'