Katherine Heigl looks stunning in never-before-seen topless pregnancy photo

Katherine Heigl welcomed son Joshua on December 20, 2016.

And this week the Grey's Anatomy veteran took to Instagram to wish the little guy a happy first birthday while sharing several never-seen-before photos from the hospital as well as a new image of the boy today.

In her caption, the blonde 27 Dresses actress revealed he didn't have the easiest birth as he was not breathing when he was delivered by C-section, the Daily Mail reports.

In the first image, she is naked while heavily pregnant as she looks out a window onto the snowy landscape outside their Utah home.

Other images are of her son in the hospital with tubes and her husband can also be seen.

And in the last photo, little Joshua is a healthy smiling boy in his mother's arms. 

The former Roswell star began her note: "At 9am one year ago today I had @joshbkelley take this photo of me so I could remember how incredibly pregnant I was right before we left for the hospital and my 12pm scheduled cesarean.

"Joshua Jr had been in the breech position for over a month and had still not moved an inch a week before his due date so I made the decision to have a cesarean and was incredibly nervous and a little scared this time last year."

"I had never been hospitalized or had ever had any kind of surgery and had no idea what to expect. The second photo is right before I went in for surgery. Trying to look cool, calm and collected! They numbed me up, gave me some morphine and opened me up. 

"My doctor struggled to get him out because he was really wedged in there and not quite ready to leave the womb.

"When she finally pulled him out at exactly 12:33pm he didn’t start breathing and they worked quickly to get oxygen in him and start his tiny lungs. @joshbkelley was standing with them when he finally took his first breath. That day, as I slowly came out of the morphine haze and clutched my tiny man to me.

"I thanked the heavens for his breath, his life and for making me a mother three times over. As evening settled in Josh and I got cozy in my hospital room, found one of my all time favorites #SweetHomeAlabama on the tv and just relished in our perfect newborn son. 

"He was so tiny and new, so fragile and tender. As I lay him down to sleep that first night in his very appropriate 'welcome to the world' sleep sack I thought the moment would last forever. 

"Yet here we are, a whole year later and it’s only the photos that remind me my brute of a boy was ever so new and small! Now he’s 26 ponds of rolling, tumbling, grasping, giggling, shouting, curious, jolly energy!

"He is everything and more than I could have hoped for and he has brought our family even more joy, love, laughter, abundance, bliss and yes, exhaustion and exasperation too! It’s been a hell of a year and I could not be more grateful for it or him! Happy Birthday to my little man! Maybe I can make this next year go a little slower!"

She already has two adopted daughters Naleigh, aged eight, and Adalaide, aged four, with husband Josh Kelley, a singer.

In January she told People: "I’ve never been determined to experience pregnancy. But I’m so grateful that I did. I think that if it hadn’t been a surprise, I’m not sure I would have done it. It was an incredible experience, it was kind of magical."

"I think it all threw me for a loop. For some reaso, I just felt like it was going to be so hard for me … I have all these stomach issues all the time and my back always hurts. 

'I thought, "Oh, pregnancy is going to wreck me, I am going to be one of those women who’s just probably sick the whole time and feels terrible and exhausted." [But] I just had a pretty easy experience.'

She also shared that there have been some highs and lows.

"One minute you’re weirdly obsessed with this baby, like 'Don’t take him out of my sight,' and the next you’re kind of blue, you’re a little sad and a little freaked out," she said.

"I actually prefer the adoption way because I wasn’t subject to hormones."

"The moment you hold your child, you’re wholly in love. And you’ll do anything to protect them and shelter them."

This article was first published on Daily Mail and is republished here with permission.