The Australian actress announced the happy news on Instagram.
Posting a beautiful black and white photo, the new mum wrote: "My heart has melted into a billion pieces a thousand times already ❤️"
She continued, "We have been blessed with the greatest joy of our lives, our baby boy. Welcome to the world Peanut, your parents love you beyond measure and you are already my little dream boat. My heart has been stolen!"
This is Strahovski's first child, who she shares with husband Tim Loden.
At the 2018 Emmy Awards, she told E!‘s Giuliana Rancic about their little one.
“Any day — hopefully not today. Just gonna hold him in there and hope for the best,” Strahovski said ahead of her due date.
After confirming she was expecting a baby boy, she laughed: “Now we have [announced it]. So it’s out!”
In May, Strahovski announced that she and Loden, whom she married over summer 2017, are expecting their first child together.
“I am very excited to finally be able to share my special news — I’m going to be a Mama!” she wrote on Instagram alongside a photo of her baby bump. “So very exciting to watch & feel this little Peanut growing every day!”