Elon Musk had eight and ninth children with top executive last year

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Tesla CEO Elon Musk reportedly had twins with a top executive at one of his companies last year, his eighth and ninth known children.

Court documents obtained by Business Insider on Wednesday showed that Musk and the children’s mother, Shivon Zilis, filed a petition to change the twins’ names in order to “have their father’s last name and contain their mother’s last name as part of their middle name.”

The order was then approved by a federal judge in May. Zilis purchased a home in the Austin, Texas, area in August, nearly three months before the twins were born, according to Business Insider. Musk also has a waterfront estate in the city.

The twins were born weeks before Musk and his then-girlfriend, the musician known as Grimes, gave birth to their second child via surrogate in December.

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The 51-year-old CEO has been an outspoken advocate for more childbirth, expressing fear of a possible fertility crisis in the U.S. and touting his own success with childbirth.

“Contrary to what many think, the richer someone is, the fewer kids they have,” Musk said in a Twitter thread. “I am a rare exception. Most people I know have zero or one kid.”

“I mean, I’m doing my part haha,” Musk said in a follow-up tweet in the thread last month.

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