Zuckerberg and 27-year-old Priscilla Chan tied the knot in his backyard before fewer than 100 guests, capping a busy week for the couple - and yes, he updated his status to "married" on Facebook.
The couple met at Harvard and had been together for more than nine years.
A source authorized by the couple to speak said Zuckerberg designed the ring featuring "a very simple ruby" that he designed himself.
Zuckerberg took his company public in one of the most anticipated stock offerings in Wall Street history Friday. And Chan graduated from medical school at the University of California, San Francisco, on Monday, the same day Zuckerberg turned 28.
The Associated Press contributed to this report.