Elon Musk’s mother Maye has posted a picture of the tycoon as a baby as he celebrates his 50th birthday.
Musk, who was born in Pretoria, South Africa, in 1971, has become one of the wealthiest people in the world with an estimated net worth of $184bn thanks to the value of his electric car company Tesla.
The eccentric billionaire responded to his mother’s public message on Twitter, which encouraged his fans to get the #HappyBirthdayElonMusk hashtag trending, with the red loveheart emoji.
Musk made his first millions when he sold his software company Zip2 in 1999, and then more than $100m (£71m) with the sale of PayPal, of which he was the largest shareholder owning just over 11%, to eBay in 2002.
He has often drawn criticism and acclaim for his antics on social media.