Grimes has given birth to her first child.
The 32-year-old Canadian singer welcomed her and Elon Musk's first child together. When one fan asked if they had a boy or a girl, Elon confirmed he is the proud father of a son.
When someone asked if they had named the child yet, Elon quipped back: "X Æ A-12 Musk (sic)"
Elon already has five children from past relationships.
Meanwhile, Grimes - who has yet to comment publicly on the news - previously confessed that being pregnant has been a "profound" experience.
She said: "For a girl, it's sacrificing your body and your freedom. It's a pretty crazy sacrifice and only half of the population has to do it. It was really profound to me when I decided I was going to do it, to actually go through the act of unprotected sex. I'm just like, I have sacrificed my power in this moment. I have, like, capitulated.
"And I have spent my whole life avoiding that situation. I have never capitulated to anything, so it was just a profound commitment."
Grimes recently said she wants to let her baby choose their own gender identity.
Asked whether she's expecting a boy or a girl, Grimes said during a YouTube livestream: "I don't want to say the gender of the baby ... because I feel like their privacy should be protected. I don't think they can consent to being famous or being in public ... I don't want to gender them in case that's not how they feel in their life. I don't know, I just feel like it doesn't need to be known ... They may decide their fate and identity."