Katherine Heigl took to social media to reveal the first adorable sonogram of her baby boy shortly after confirming her pregnancy on Thursday (23 June). The pregnancy is a first for the Home Sweet Hell actress, who shares two adopted daughters with her husband Josh Kelley. Naleigh, 7, and Adalaide, 4, were adopted in 2009 and 2012 respectively.

The 37-year-old actress shared the sonogram on her Instagram account with the caption: "@joshbkelley and I have some news ... go to thoseheavenlydays.com and I'll tell you allllll about it!"

Soon after the gorgeous lady shared the sonogram of her child, singer/songwriter Kelley posted a photo of himself with his partner on his Instagram account. In the photo, a little heavier Kelley and Heigl are all smiles.

The singer has captioned the photo: "Hahaha!! Well I guess the cats out the bag!!!! We're so excited people!!! What an awesome journey !!! Can't wait to hold this little nugget❤️❤️Not sure where they found this photo but I was 25 pounds heavier then @people #peoplemagazine."

The Knocked Up actress has also shared her thoughts on her pregnancy on her personal website Thoseheavenlydays.

"We are expecting a third addition to our tribe! It was totally unexpected but thrilling nonetheless," she wrote. "Naleigh and Adalaide are over the moon and cannot wait to spoil their new sibling rotten and of course Josh and I are full of high hopes and bubbling anticipation."

"The whole pregnancy thing is new to me but the thrill of having a baby is not. We've known for awhile 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," she said. "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!"

Katherine Heigl
Katherine Heigl and her husband Josh Kelley got married in 2007 after they met on the set of Kelley's music video titled Only You in 2005Reuters

"I can't wait to share my pregnancy experience with you here on Those Heavenly Days and hopefully get some advice from all you experienced gestaters (yes I made that word up). I've learned so much already and know there's even more to learn as this baby grows. I've found some great tricks to combat pregnancy indigestion, apps that have not only kept me informed on the development of our baby but have offered reassurance and relief when I'm feeling nervous or afraid, and great blogs, and books on healthy pregnancy nutrition.

"This is truly an amazingly blessed time, waiting for the child you've been dreaming of to make their appearance. Though I've never been a particularly patient person, my experience of waiting for Naleigh taught me a lot in that department. So I will wait and eagerly anticipate, hopefully with grace, gratitude and a good attitude (ummm pregnancy hormones are real people.) 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."

Heigl and Kelley got married in 2007 after they met on the set of Kelley's music video titled Only You in 2005.