Katherine Heigl and Josh Kelley are expecting their third child

Katherine Heigl and husband Josh Kelley announced Thursday that they’re pregnant, with the actress sharing a sonogram photo to her Instagram account and directing fans to a post on her blog talking about her pregnancy.  

“The Kelley family received some very exciting news recently and I’ve been dying to share it with you all,” Heigl wrote. “We are expecting a third addition to our tribe!”

The photo on Heigl’s blog post features a pair of blue baby booties and the caption: “Blue is for … BOY!!!”

The couple, who married in 2007, adopted daughter Naleigh from South Korea when she was 9 months old. They expanded their family again in 2012 with the domestic adoption of daughter Adalaide.

“Naleigh and Adalaide are over the moon and cannot wait to spoil their new sibling rotten,” Heigl wrote. “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.”

On Sunday, Heigl, 37, tweeted a photo of herself with Kelley and their daughters with a message wishing him a happy Father’s Day and expressing her love and adoration for him, but giving no indication to followers that their little family was about to grow.

Heigl and Kelley’s choice to adopt before growing their family through pregnancy was always the plan for the actress, who wanted her family to reflect her own family growing up. 

“My sister Meg is Korean, and my parents adopted her three years before I was born, Heigl told Parent & Child in 2012. “I wanted my own family to resemble the one I came from, so I always knew I wanted to adopt from Korea.”

“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,” Heigl wrote on her blog. “We were considering adoption again, fostering, or pregnancy if possible.”

The actress then quipped: “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!”

Heigl is returning to television this year in CBS’ new drama “Doubt,” starring alongside Laverne Cox (“Orange Is the New Black”) and Steven Pasquale (“The People v. O.J. Simpson: American Crime Story”).

“Doubt” centers around a successful defense attorney, played by Heigl, falling for a charismatic client who may be guilty of a brutal crime.

While her pregnancy has spurred a lot of excitement for the family, Heigl’s sentiments from her 2012 interview ring as true as ever.

“I just wanted to be a mom. However we do that, it’s fine with me.”

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Mila Kunis and Ashton Kutcher are expecting a second baby

libby.hill@latimes.com

Twitter: @midwestspitfire