Guess who was Mark Zuckerberg's special guest on his 32nd birthday!

Zee Media Bureau

Facebook founder and CEO Mark Zuckerberg had a special guest at his company headquarters on his 32nd birthday on Saturday. And guess who that was?

It was none other than his 6-month old daughter Max.

Zuckerberg, who turned 32 on Saturday, took to Facebook to to announced the news of the little visitor as his California office.

“Max stopped by Facebook HQ to help celebrate my birthday,” he posted.

“Thanks to everyone for so many nice messages. Here's to another year of connecting the world!” he added.

Along with the post, Zuckerberg posted this adorable picture of his daughter Max sitting on the lap of Facebook Chief Operating Officer Sheryl Sandberg as mom Priscilla Chan and others looked on as he blew out the candles on the birthday cake.

"Max and I were thrilled to celebrate her dad's birthday together!" Sandberg wrote in a comment on Zuckerberg's post.