Facebook's Mark Zuckerberg and Priscilla Chan Expecting Baby Girl No. 3

 his home, Mark Zuckerberg is about to be drastically outnumbered.

On September 21, the 37-year-old Priscilla Chan, wife of the 38-year-old co-founder of Facebook

announced that they were expecting a second daughter.

"Lots of love," Mark captioned his Instagram photo

which showed a picture of the Meta CEO with his hand on Priscilla's baby tummy.

Mark and the former paediatrician are parents to daughters Maxima, 6, and August, 5. 

Happy to announce that Max and August will get a new baby sister in 2019!

Since becoming parents, Mark and Priscilla have made it a priority to improve the world for all children, not just for their girls.

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