The couple's baby girl is named Exa Dark Sideræl, but her parents call her Y.
The “Oblivion” singer debuted her full back tattoo done in white ink on Instagram Sunday.
The singer did not mention in her Instagram post whether her baby or her boyfriend, Elon Musk, got sick, but she oddly gave SZA a shout-out.
The singer and Tesla CEO raised eyebrows when they recently announced they named their son X Æ A-12.
The singer's mother, Sandy Garossino, sent the angry tweet after the Tesla CEO tweeted, "Take the red pill."
The actor even looped in her ex-husband, Chris Martin, to talk about X Æ A-12 Musk.
Musk went on Joe Rogan’s podcast to explain how to say little X Æ A-12 Musk’s name … and it’s not the same way Grimes pronounces it.
The state's department of public health weighed in on the name the SpaceX CEO and Grimes chose for their son.
The two went back and forth on Twitter over a mistake in the description of little X Æ A-12 Musk's moniker.
Oh, and the baby's name is apparently X Æ A-12 Musk, according to the new dad's Twitter.