Elon Musk and his ex-girlfriend Grimes have welcomed their second child in secret.
Elon Musk and Grimes have welcomed a daughter in secret
The singer confirmed that she and the Tesla founder had become parents again in an interview with the new issue of Vanity Fair magazine.
Grimes – who also shares 22-month-old son X Æ A-Xii, with Elon – confirmed that the pair welcomed a daughter in December 2021 via surrogate.
The baby's name is Exa Dark Sideræl, though the pair are said to have nicknamed her Y.
Grimes explained her daughter's unique name by describing how Exa refers to a supercomputing term, exaFLOPS, while Dark Universe represents "the unknown".
She said: "People fear it but truly it's the absence of photons. Dark matter is the beautiful mystery of our universe."
Grimes described Sideræl as the "more elven" spelling of 'sidereal' – which she defined as "the true time of the universe, star time, deep space time, not our relative earth time".
The name is also a nod to the star's favourite 'Lord of the Rings' character, Galadriel.
Despite splitting up last September, Grimes revealed that she still considers Musk to be her "boyfriend" but describes their relationship is "very fluid".
The pop star, whose real name is Claire Boucher, said: "There's no real word for it. I would probably refer to him as my boyfriend, but we're very fluid.
"We live in separate houses. We're best friends. We see each other all the time... We just have our own thing going on, and I don't expect other people to understand it.
"This is the best it's ever been... We just need to be free."
Grimes also hinted that she and Elon want to have more children.
She said: "We've always wanted at least three or four."
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