“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. Built like a juggernaut, with a solid heart of gold. Love him so much," Zilis wrote, also revealing the name of the couple's previously-born child in the announcement.

Elon Musk has welcomed his fourteenth child, and his fourth baby with Shivon Zilis. The pair welcomed their second son together, Seldon Lycurgus.

"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. Built like a juggernaut, with a solid heart of gold.