The gorgeous way Katherine Heigl revealed to her adopted daughters she was pregnant.

Katherine Heigl has shared the first photos of her baby boy, Joshua Bishop, who was born just before Christmas.

In an interview with PEOPLE magazine, the actress also shared the very special moment she shared with her two daughters – who are adopted – when she revealed to them she was expecting.

@joshbkelley and I are beyond thrilled to finally share the arrival of our little man Joshua Bishop Kelley Jr born December 20th, weighing in at 7 pounds 15 ounces. We are all happy, healthy and beyond grateful! For more pics and the exclusive story check out @people magazine (out Friday) who I must profusely thank for helping us to announce our happy news in a beautiful, honest and loving way! I also want to give a big hearty loving shoutout to my bestie @cheyenneellis for the gorgeous photos including this one! And one more GIANT thank you to all of you for your wonderful words of support, love and all those beautiful well wishes! As always I am incredibly grateful to have such wonderful fans! ❤️❤️❤️❤️❤️❤️

A photo posted by Katherine Heigl (@katherineheigl) on Jan 25, 2017 at 7:56am PST

Heigl and her husband, Josh Kelley, waited until she was 12 weeks pregnant before sharing the news with eight-year-old Naleigh and Adalaide, 4.

“I was so relieved to get to share it,” the former Grey’s Anatomy star said, admitting that the news was a “little confusing” because of their unique family dynamic.

“[The girls were like], ‘I grew in your tummy?’ And I had to explain, ‘Well, you didn’t actually grow in my tummy, but your dad and I are your parents,’” she said.

Happy New Years Eve from the Kelley girls! Here’s to a spectacular, joyful abundant 2017 for all! ????????????

A photo posted by Katherine Heigl (@katherineheigl) on Dec 31, 2016 at 6:33pm PST

Heigl’s own big sister was adopted from Korea before she was born, so she’s equipped with answers to any questions her girls might have about their family.

“My mother used to say…’It doesn’t matter how they come into your life. The moment they put that child into your arms – whether you just [gave birth] or whether they just arrived from Korea — they’re yours’,” she said.

This moment though…????Another great shot by my girl @cheyenneellis for @people magazine which hits stands Friday. We had such an amazing experience working with @people to share our new joy with you all! I must give two more BIG BIG thanks to my incredible glam squad @davidbabaii and @debraferullomakeup for coming all the way to Utah to make me look pretty for these pics! You guys are the best of the best and I love you! ????????❤️

A photo posted by Katherine Heigl (@katherineheigl) on Jan 26, 2017 at 7:22am PST

Despite the confusion over where their new baby brother was coming from, the actress says her girls are unaware of “how different” their family looks.

“I don’t think that even factors into their consciousness at this point. It will as they get older, they’ll be like, ‘Wait a minute, we all look really different, and what does that mean for me?’

“We’re there to support them as parents do. It’s all about open communication and helping them access whatever they need to feel absolutely 100 percent secure in who they are.”