Grimes is now a mum of three. The news of her third child — named Techno Mechanicus — with Elon Musk was revealed in an upcoming Musk biography by Walter Isaacson, and Grimes confirmed the baby's arrival on Twitter (now X). "I wish I could show u how cute little Techno is but my priority rn is keeping my babies out of the public eye," she wrote in part.

Grimes and Musk welcomed their first child together, X Æ A-Xii, in May 2020. The pair also call their son X. They next welcomed a daughter in 2021; her name was originally Exa Dark Sideræl Musk, but in March 2023, Grimes revealed that they had changed her name. The musician shared a photo of her daughter on Twitter, and when someone commented "omg baby sailor mars hiiii," Grimes replied, "She's Y now, or 'Why' or just '?' (But the government won't recognize that)." Y, she appeared to say, represents "curiosity, the eternal question, and such."

Though Musk and Grimes welcomed a new child together, it's unclear if they're in a romantic relationship. Musk has 11 known children with three different partners, per Insider. He and his first wife, author Justine Wilson, gave birth to a child named Nevada Alexander Musk in 2002, though he died at 10 weeks old. Afterwards, Wilson and Elon welcomed twins named Griffin and Vivian Musk in 2004, and then went on to have triplets named Kai, Saxon, and Damian Musk in 2006. Elon also has twins with Shivon Zilis, the director of operations of Elon's company Neuralink. The twins were reportedly born in November 2021 — just one month before the birth of Y.

Ahead, learn more about Grimes and Elon's two kids together.