Elon Musk, a Tesla chief executive, became a father again last year, having twins with one of his top executives, Shivon Zilis.
According to Business Insider, the twins were born in Austin, Texas in November. They were born just weeks before Musk and Claire Boucher, the musician known as Grimes, had their second child via surrogate in December.
In April, Musk and Zilis filed a petition to give the twins their father's last name and their mother's last name as part of their middle name, according to court documents.
A month later, a Texas judge approved the petition, according to the report.
The report said that Zillis could be one of the people that Musk might use to run Twitter once his $44 billion acquisition deal is completed.
Zilis, 36, is identified on her LinkedIn profile as a director of operations and special projects at Neuralink, co-founded and chaired by Musk, 51.
Musk's total number of children is nine, according to the news. Musk has two children with Grimes. He has five children with his ex-wife, Canadian author Justine Wilson.
Musk, who regularly tweets, hadn't been heard from in nine days until last week when he broke his silence on a trip to Italy where he was shown in a picture with his four sons and Pope Francis.
Musk is the wealthiest person in the world, with an estimated net worth of $220 billion.