First look! Katherine Heigl shared a first sonogram of her baby-boy-to-be via Instagram on Thursday, June 23, the same day she confirmed that she and husband Josh Kelley are expecting their third child together.

“@joshbkelley and I have some news … go to thoseheavenlydays.com and I’ll tell you allllll about it!” she captioned the snapshot, in which the profile of her baby-to-be can be identified clearly.

@joshbkelley and I have some news...go to thoseheavenlydays.com and I'll tell you alllllll about it! 🍼🎉💙

A photo posted by Katherine Heigl (@katherineheigl) on

Singer Kelley, 36, similarly took to Instagram to share the couple’s happy news, joking that the cat's “out of the bag.”

“We’re so excited people!!! What an awesome journey!!!” he captioned a photo of the pair. “Can’t wait to hold this little nugget. Not sure where they found this photo but I was 25 pounds heavier then.”

Heigl, 37, and Kelley are already parents to daughters Naleigh, 7, and Adalaide, 4. (They tied the knot in 2007 after meeting on the set of his music video for “Only You” in 2005.)

In a post to her website, the former Grey’s Anatomy star gushed about their impending bundle of joy, her first baby as a “gestater.”

“The whole pregnancy thing is new to me, but the thrill of having a baby is not,” she explained. The couple adopted Naleigh in 2009 and Adalaide in 2012. “We’ve known for a while that we wanted to add to our family and frankly didn’t really care how we chose to do that. We were considering adoption again, fostering or pregnancy if possible. Seeing as I have never been pregnant and, as my OB/GYN reminded me last year, I’m of advanced maternal age, I wasn’t sure pregnancy was even in the cards for us. Turns out it was very much in the cards!”

The Knocked Up actress added that she’s never considered herself “particularly patient,” but that she knows their son will be worth the wait.

“So I will wait and eagerly anticipate, hopefully with grace, gratitude and a good attitude (ummm pregnancy hormones are real people),” she wrote. “Maybe this time the waiting won’t be so hard because I’ll have all of you to share the laughter, tears and joys of my experience with. So stay tuned … XOXO, KT.”

Can't get enough of Us? Sign up now for the Us Weekly newsletter packed with the latest celeb news, hot pics and more!