Grimes Reveals Birth of Second Child With Elon Musk: Exa Dark Sideræl Musk

According to a Vanity Fair profile published on Thursday, Grimes invited the interviewer to her home to discuss the upcoming album "Book 1." 

During the interview, the 33-year-old interviewer heard the unmistakable sounds of a baby and she asked if she had another baby in her life. 

"I’m not at liberty to speak on these things," Grimes told the outlet. "Whatever is going on with family stuff, I just feel like kids need to stay out of it, and [my son] X is just out here. 

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." 

While Grimes hesitated at first, she finally revealed that yes, she and the Tesla and SpaceX founder Elon Musk welcomed a baby girl.. 

"She’s a little colicky too," said Grimes, who chuckled over the idea of keeping the announcement under wraps. "I don’t know. I don’t know what I was thinking." 

The baby's unusual name was inspired by the supercomputing term exaFLOPS. The outlet shared that the baby’s name is Exa Dark Sideræl Musk. Her nickname is "Y." 

Exa "is a reference to the supercomputing term exaFLOPS (the ability to perform 1 quintillion floating-point operations per second)." 

Grimes shared that she and Elon,  "occasionally call her Sailor Mars," which is a nod to the "Sailor Moon" manga.