Elon Musk has welcomed his 14th child, a son named Seldon Lycurgus, with Neuralink executive Shivon Zilis.
Zilis announced the news on X, though she did not reveal when the baby was born.
Musk who serves as a close adviser to US President Donald Trump, responded to the announcement with a heart emoji.
The post has since gone viral, garnering more than three million views.
Shivon Zillis tweet about giving birth to Elon Musk's 14th child
SHIVON ZILLIS
In her announcement, Zilis wrote: "Discussed with Elon and, in light of beautiful Arcadia's birthday, we felt it was better to also just share directly about our wonderful and incredible son Seldon Lycurgus."
She described the newborn as "built like a juggernaut, with a solid heart of gold."
"Love him so much," she added in the heartfelt post.
The couple are parents to three-year-old twins, Strider and Azure, whose relationship first made headlines in 2022.
They also have a daughter named Arcadia, who celebrated her first birthday on Friday.
It remains unclear how long Musk and Zilis have been romantically linked, though their relationship became public knowledge when court documents revealed they had welcomed twins in 2021.
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Elon Musk has 13 other children with three other women
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The news comes just two weeks after conservative influencer Ashley St. Clair claimed she had also recently had a child with Musk.
St. Clair alleged she welcomed a baby with the billionaire five months ago.
According to reports, she is now suing Musk for custody and a genetic test to recognise him as the child's father.
St. Clair claimed Musk had been unresponsive to attempts to establish a co-parenting agreement.
Musk's extensive family includes five children with ex-wife Justine Wilson: twins Griffin and Vivian, 20, and triplets Kai, Saxon and Damian, 19.
Their first son, Nevada Alexander, died at 10 weeks old in 2002.
The billionaire also shares three children with singer Grimes: X Æ A-12, four, Exa Dark Sideræl, three, and Techno Mechanicus, two.
With Seldon's birth, Musk now has 14 known children.
Fans have reacted to the news on social media with largely positive comments, with one writing: "Wow, another one? Well the baby will be well provided for."
A second commented: "Beautiful couple. Loved seeing you at the White House together."
"You're a lucky couple! Best wishes," said a third person, while a fourth added: "I see respect and love. Thank you for sharing with us. You both look gorgeous in your recent trip to the White House."
