Grimes and Elon Musk Had a Second Child, Exa Dark Sideræl Musk, in December 2021

The parents are calling the baby girl Y, according to a new Vanity Fair interview

Elon Musk and Grimes in 2018
Elon Musk and Grimes in 2018 (Kevin Tachman/Getty Images for Vogue)

Grimes and the billionaire Elon Musk had a second child this past December, a baby girl named Exa Dark Sideræl Musk, Vanity Fair reports. Grimes said she wanted to keep most details of her daughter’s life private, identifying her only as Y, but eventually revealed the full name to the writer, Devin Gordon. 

Grimes says her difficult pregnancy with her and Musk’s first child, X Æ A-12, or X, prompted the parents to have their second child via surrogate. At one point during the previous pregnancy, Grimes said, “I hemorrhaged. It was scary.” 

Last year, Musk told Time that the couple were semi-separated, but Grimes said the relationship remains in flux. “I would probably refer to him as my boyfriend, but we’re very fluid. We live in separate houses. We’re best friends. We see each other all the time…. We just have our own thing going on, and I don’t expect other people to understand it.” She added that they want “at least three or four” children. 

Grimes is also working on a new LP, tentatively titled Book 1, which she says features a collaboration with the Weeknd and Illangelo called “Sci-Fi.” She announced Book 1 in January with the single “Shinigami Eyes.” At the time, she was also said to be preparing an EP titled Fairies Cum First, described in a press release as a “prelude” to her album. (The EP was not mentioned in the Vanity Fair article.) Book 1, according to Vanity Fair, “is Grimes’s Mellon Collie and the Infinite Sadness, with a hint of Lemonade, and it was partly inspired by a theory of Musk’s: that she’s a simulation.”

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