Josh Kelley Shares Adorable New Snap of His 'Happy Little Dude' With Katherine Heigl -- See the Pic!

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Joshua Bishop Kelley Jr. is one "happy little dude"!

Josh Kelley took to Instagram on Wednesday to share a sweet new photo of his son with Katherine Heigl, showing off baby Joshua's adorable morning excitement.

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

"He's a happy little dude in the morning !!" the 37-year-old singer captioned the cute pic. "Love this little buddy."

RELATED: Katherine Heigl Gets 'Back on the Exercise Train' After Welcoming Son -- See Her Hilarious Outfit!

Though Joshua isn't Kelley and Heigl's first child -- the two are already parents to adopted daughters Naleigh, 8, and Adalaide, 4 -- they definitely can't get enough of their newborn son… and Heigl is already ready for more!

ET caught up with the Doubt star last week, where she gushed about adding to her family.

"I think once you have two, it doesn’t matter anymore!" she laughed. "I've already tried to have this conversation, but it's so funny -- at eight weeks, [Kelley is] like, 'I'm not talking about this right now!'"

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

See more in the video below.