Mark Zuckerberg made a rare personal post on social media.

The Facebook co-founder and his wife, Priscilla Chan, shared photos of themselves posing with their three daughters.

"Grateful for my first 40 years!" Zuckerberg captioned the post on Instagram.

"Priscilla surprised me with a little party and recreated some of the places we lived in our early years... Cheers to the next 40!" Mark added.

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A post shared by Mark Zuckerberg (@zuck)

Chan wrote: "Mark usually doesn't let me throw him big birthday parties, but for his 40th I got to gather our friends and family."

"We had so much fun!" she added, noting that what she admires most about her husband is his ability to "see potential in everyone."

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A post shared by Priscilla Chan (@priscillachan)

The couple share three daughters together; Maxima, eight, August, six, and Aurelia, one.

They have been together since 2003.

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