He's one of the most private billionaires in the world, renowned for his reclusive life away from the public eye.
But with the latest addition to Mark Zuckerberg's family, users of the social networking site have been given a rare insight into the Facebook founder's home.
The 26-year-old posted photos of his new dog, his girlfriend and himself in their modest house on Facebook - a far cry from the billionaire's mansion one might expect.
The cute pup - who has been ironically named 'Beast' - has been given his own Facebook page and already has more than 2,000 'likes'.
On the page he is described as "a public figure who likes cuddling, loving and eating."
Photo: © Facebook