SILICON VALLEY (Web Desk) – Facebook CEO Mark Zuckerberg became father after his wife Priscilla Chan gave birth to a girl late Tuesday.

Mr Zuckerberg and Ms Chan also announced they will donate 99% of their Facebook stock – nearly $45 billion – in their lifetimes.

In a post at Facebook, Zuckerberg said: “Priscilla and I are so happy to welcome our daughter Max into this world,” adding sharing a letter he and wife Priscilla wrote to newly born Max.

The founder of world’s largest social media network Facebook pledged to work towards making world a better place and take measurements for curing deadly diseases on earth in the letter.

Zuckerberg also thanked all of his fans and supporters who became a source of strength to the couple during pregnancy.

Priscilla and I are so happy to welcome our daughter Max into this world!For her birth, we wrote a letter to her about…

Posted by Mark Zuckerberg on Tuesday, December 1, 2015

Meanwhile Microsoft founder Bill Gates has also wrote a welcome note for Max and the parent couple.

Welcome, Max! And congratulations, Mark and Priscilla. This is fantastic, inspiring news.

Posted by Bill Gates on Tuesday, December 1, 2015