The 31-year-old shared a message Tuesday afternoon with his 42.5 million followers, in which he announces the birth of his and Priscilla Chan's first child and a new plan of attack to give away $45 billion of his fortune.
"Priscilla and I are so happy to welcome our daughter Max into this world," he begins excitedly. "For her birth, we wrote a letter to her about the world we hope she grows up in. It's a world where our generation can advance human potential and promote equality -- by curing disease, personalizing learning, harnessing clean energy, connecting people, building strong communities, reducing poverty, providing equal rights and spreading understanding across nations. We are committed to doing our small part to help create this world for all children. We will give 99% of our Facebook shares -- currently about $45 billion -- during our lives to join many others in improving this world for the next generation. Thank you to everyone in this community for all your love and support during the pregnancy. You've given us hope that together we can build this world for Max and all children."
You can read the new parents letter to their daughter, in full, here.
It's surely a happy day for the young couple.
After meeting at Harvard back in 2003, they dated and eventually married in May 2012. This past summer, Mark announced their current pregnancy on Facebook and, at the same time, revealed that Chan had previously suffered three miscarriages.
The giving nature of Zuckerberg and his wife shouldn't come as a surprise to anyone.
They're listed as pledgers on The Giving Pledge, an initiative which asks the world's wealthiest individuals and families to dedicate the majority of their wealth to philanthropy.
That doesn't mean he'll be writing an 11-figure check anytime soon.
According to Buzzfeed, an SEC filing notes that Mark won't give away more than $1 billion per year over the next three years. He'll also make sure to retain "his majority voting position in [Facebook's] stock for the foreseeable future."