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The 31-year-old singer took to social media to do a question and answer session with her fans when one asked whether she's having a 'girl or boy?'
In response, the 'Oblivion' hitmaker used a gender-neutral pronoun to say: "They may decide their fate and identity."
They may decide their fate and identity https://t.co/cv3iAlfKei
- ༺GRIMES༻ (@Grimezsz) February 21, 2020
In another question, someone asked whether she's nervous about motherhood to which she quite reasonably responded: "Yeah."
Grimes also explained that when she's on maternity leave she will try and 'master a few more games', after someone asked whether she's planning to do a live stream soon.
News about the pregnancy came after the Canadian singer, who is actually called Claire Boucher, posted a picture to Instagram with her stomach on display.
Initially, she posted an uncensored picture showing the outline of a foetus photoshopped onto her body.
Then - thanks to Instagram's rules about showing female nipples - the photo was deleted and replaced.
In a comment underneath the now-deleted original photograph, Grimes seemed to confirm that she and Musk are to become parents, writing: "I thought about censoring them for a hot minute haha (this may get taken down anyway) but the photo is so much less feral without the nipples."
She went on: "Plus being knocked up is a very feral & war-like state of being.
"Might as well be what it is. Plus most of my friends told me not to post them so then I was afflicted w reverse psychology.
"Interrogated my shame on it and decided it was sum weird internalized self hatred to feel uncomfortable abt my body [sic]."
While this is Boucher's first child, 48-year-old entrepreneur Musk already has five children - a set of twins and a set of triplets - with his first wife Justine Wilson, from whom he divorced in 2008.
He has subsequently been married twice to British actor Talulah Riley, before they divorced for the second time in 2016.
Musk, who owns rocket and spacecraft manufacturer SpaceX as well as his electric car and energy company Tesla, is worth a reported $29.2bn (£22.3bn).
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