Mark Zuckerberg's wife Priscilla gives birth to their second daughter, August, and the couple share a touching picture of older sister Maxima playing with her on the couch

Mark Zuckerberg's wife Priscilla Chan has given birth to their second daughter. Chan gave birth this month and they named the baby girl August. The Facebook CEO announced news of the birth on Monday with an open letter. They announced they were expecting back in March. The couple already have a daughter named Max.