Grimes has given birth to her first child.
The 32-year-old Canadian singer welcomed her and Elon Musk's first child together, a baby boy.
Earlier in the day, Elon declared the birth was just ''a few hours away'', before later adding another tweet to say that ''mom and baby [was] all good''.
When one fan asked if they had a boy or a girl, Elon confirmed he was 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 is yet to comment publicly on the news of her arrival - previously confessed that falling 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.''
And whilst her little one was born a boy, 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 live stream: ''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.''
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