Mark Zuckerberg, Priscilla Chan Pregnant: Facebook Boss Shares Pregnancy Photos By Annie Leibovitz -- See Here!

Mark Zuckerberg and wife Priscilla Chan announced they were expecting their first child in August, as Parent Herald rpreviously reported. Now, the expectant father happily shared a photo of his wife and her growing belly on his social networking site.

The Facebook honcho described the photo of his wife as "stunning," and wrote , "I love her expression: intense yet kind, fierce yet loving, leading yet always supporting others. Thank you to Annie Leibovitz for capturing her spirit so beautifully." He's seen smiling as he embraced his wife, clutching Priscilla's belly in the shot.

Back in October, Mark also posted a behind-the-scenes take on the photo shoot on his Facebook account.

Vanity Fair reported that the shoot was for the magazine's New Establishment Summit held last month in San Francisco. Famed photographer Annie Leibovitz set up the backstage to do the portraits of the event's guests.

Mark and Priscilla married in 2012 after years of being together, per Us Weekly. When they announced they were going to have a baby, they also told the world their struggles with conceiving as the Zuckerbergs have had three miscarriages.

"When we started talking to our friends, we realized how frequently this happened -- that many people we knew had similar issues and that nearly all had healthy children after all. We hope that sharing our experience will give more people the same hope we felt and will help more people feel comfortable sharing their stories as well," wrote Mark in his Facebook announcement. The couple has yet to announce the baby's due date, but they already know they're having a baby girl.

Meanwhile, Priscilla continues with her philanthropic work even when she's heavy with child. As a matter of fact, the couple recently opened The Primary School, "a private, comprehensive preschool and kindergarten through eighth grade school" that will be serving underpriviledged residents of East Palo Alto. It's a project that is close to Priscilla's heart as a pediatrician and a school teacher.

Mark also shared his wife's achievements for this school in another Facebook post. "I'm so proud of Priscilla for starting The Primary School- a new kind of school that brings education and healthcare together," the message partly read.