The singer – whose real name is Claire Elise Boucher – has two-year-old son X Æ A-Xii and daughter Exa Dark Sideræl, 15 months, with Twitter chief Elon Musk.

Their daughter was secretly born via surrogate, and Grimes accidentally revealed the news during a Vanity Fair interview in March 2022 when the reporter heard crying in her house.

At the time, the 35-year-old musician explained she wanted to keep her daughter’s identity a secret after their boy was ‘just out there’.

This week, she shared a rare picture of her girl on Twitter, posting two photos of her and her daughter in matching red onesies and green hair.

She captioned the post: ‘Y 🐉 C’

And revealing the new name she confirmed: ‘She’s Y now, or “Why?” or just “?” (But the government won’t recognize that). curiosity, the eternal question, .. and such. (sic)’

It’s not the first time she’s had issues with the government when it comes to authorities recognising her children’s names.

She previously had to change X’s name after X Æ A-12 was deemed to be a violation of California laws, leading to the number being changed to Xii.

Meanwhile, Grimes explained while she typically doesn’t share photos of her daughter in order to protect her ‘privacy’, she felt she could make an exception because she looks ‘fairly unrecognisable’ in the snap.

When she revealed Y’s identity last year, and told writer Devin Gordon that she thinks regardless of what’s ‘going on’ with the family, children ‘need to stay out of it’.

She said: ‘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 [Musk] 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.’