Zuckerberg, 31, and Chan, 30, have been open about their journey to becoming parents, revealing that they had three miscarriages and that he would take two months of paternity leave.
Zuckerberg is also giving the world his own gift now that he has one: the CEO announced that they'd donate 99 percent of their Facebook stock, worth about $45 billion, "during our lives" to promote equality. Their initiative will target research for common causes of death, including heart disease, as well as education.
Congratulations to the couple and, uh, mankind too, it sounds like!
See Zuckerberg's full Facebook announcement below: