Grimes is a mom-of-two!
The singer, 33, secretly welcomed her second child with Elon Musk, 50, she revealed to Vanity Fair in a cover story for the magazine's April 2022 issue.
The musician invited a journalist over to her home in Austin, Texas, for the interview. When they heard a baby cry, they asked if she had another child apart from the son.
"I'm not at liberty to speak on these things," Grimes told the magazine in response. "Whatever is going on with family stuff, I just feel like kids need to stay out of it, and X is just out there.
"I mean, I think E is really seeing him as a protégé and bringing him to everything and stuff.… X is out there. His situation is like that. But, yeah, I don't know."
Grimes told the outlet that she and Musk welcomed a daughter in December 2021 via surrogate.
The baby's full name is Exa Dark Sideræl, though they've nicknamed her Y, per Vanity Fair.
Grimes explained her daughter's unique name to the outlet, telling the magazine that Exa refers to a supercomputing term, exaFLOPS, while Dark represents "the unknown."
She explained: "People fear it but truly it's the absence of photons. Dark matter is the beautiful mystery of our universe."
Sideræl, the third part of Y's full name, is pronounced "sigh-deer-ee-el".
Grimes called the word "a more elven" spelling of sidereal, which she defined as "the true time of the universe, star time, deep space-time, not our relative earth time."
Sideræl has a double meaning, too, as a shoutout to Grimes' favorite Lord of the Rings character, Galadriel, who "chooses to abdicate the ring."
Grimes told Vanity Fair that she was "fighting" to name her daughter Odysseus Musk, because "a girl named Odysseus is my dream," but she and Musk settled on Exa Dark Sideræl instead.
Despite splitting up in September 2021 after three years together, Grimes told Vanity Fair that she and Musk are back together. "There's no real word for it," she said.
"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.
She added that she and Musk are happy together, telling the outlet: "This is the best it's ever been. We just need to be free."
What's more, Grimes revealed that the pair are planning on having more children, telling the outlet: "We've always wanted at least three or four."
