"We have been very lucky to have had a peaceful few weeks at home, but I would like to release this myself before others do. I gave birth to our son Noah Shannon Green on September 27th. He is healthy, happy, and perfect," she posted on Wednesday morning.
"We are humbled to have the opportunity to call ourselves the parents of this beautiful soul and I am forever grateful to God for allowing me to know this kind of boundless, immaculate love," she added. "Thanks to those of you who wish to send your positive energy and well wishes. May God bless you and your families abundantly."
It's the first child for Fox, though she's played stepmother to Green's son Kassius for the majority of his life.
"A lot of things make me happy. But I feel unbelievably happy when my nine-year-old stepson tells me I'm beautiful. Kassius is one of the most beautiful things about my life," she said last year.
Fox and Green — who married in 2010 — have been together since she was just a teen.
"When I started living with Brian, his son was only two and I was 18. But ever since I've felt like we've created this family together," she continued. "I've basically been looking after Kassius since he was three and that's part of my world that very few people really ever understood about me."
Still, the actress expressed her hopes to be a mother in an interview with Cosmo earlier this year.
"I want at least two, probably three [kids]. I've always been maternal," she told the magazine.
We know one thing: Noah is going to be one photogenic kid!
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