In a surprise ceremony, Facebook CEO and founder Mark Zuckerberg married his longtime girlfriend, Priscilla Chan, in a private wedding at his home in Palo Alto, Calif. on Saturday.

Zuckerberg, who just became a billionaire as a result of the Facebook IPO on Friday, reportedly placed a ring on his wife's finger during the ceremony — the ring, said to be designed by Zuckerberg himself, was described as featuring a "very simple ruby."

According to the Associated Press, Zuckerberg's marriage to Priscilla Chan took place in front of about 100 invited guests who thought they were celebrating Ms. Chan's medical school graduation. It all happened in Zuckerberg's backyard.

Take a look at Zuckerberg's personal page on Facebook, and you'll see the above picture, which Zuckerberg reportedly placed onto his own site as a change of his status after the ceremony.

The couple met while both were attending Harvard, and have been together for nine years.

It was a dramatic day of a big week for Zuckerberg:

Zuckerberg's Very Big Week

Photo courtesy Mark Zuckerberg/Facebook

