What We Know About Grimes' 'Secret' Second Baby With Elon Musk

One of Hollywood's hottest couples, singing sensation Grimes and Elon Musk, the wealthiest man in the world, have welcomed another child into the world. The happy news has been kept under wraps for several months but Grimes unexpectedly let the cat out of the bag during a chat with Vanity Fair.

Now, their first-born, son X has a younger sibling, and Grimes and Musk could not be happier. The news of a second-born may come as a surprise after the couple faced questions over the status of their relationship following news of a split in September 2021, just one year after the birth of X.

Grimes confirmed in her chat with Vanity Fair that she and Musk are happier than ever, stating "this is the best it's ever been." So, what about their new little bundle of joy? Newsweek has everything you need to know.

What We Know About Grimes' 'Secret' Second Baby With Elon Musk

1. It's a girl

While Grimes was in conversation with Vanity Fair interviewer Devin Gordon, a baby was heard crying upstairs and Grimes confirmed that she and Musk had recently welcomed a daughter.

Grimes, full name Claire Boucher, told Vanity Fair: "I'm not at liberty to speak on these things. Whatever is going on with family stuff, I just feel like kids need to stay out of it, and X is just out there," before changing her mind to share the news.

She said: "She's a little colicky too," adding, "I don't know. I don't know what I was thinking."

She also shared that her daughter was born in December 2021 and that, with her newborn and X, she had moved from LA to Austin, just a short drive from the Tesla factory where her husband is often based.

2. Her name is Exa Dark Sideræl Musk

Just like her older brother, the newborn has an unusual name with a whole load of meaning. The girl's full name is Exa Dark Sideræl Musk, or 'Y' for short.

Grimes explained to Vanity Fair that Exa is a reference to the supercomputing term exaFLOPS (the ability to perform 1 quintillion floating-point operations per second) and Dark references the unknown.

Sideræl pronounced sigh-deer-ee-el relates to "the true time of the universe, star time, deep space-time, not our relative Earth time," Grimes said and is also a homage to her favorite Lord of the Rings character, Galadriel.

In May 2020, Grimes and Musk stunned the world when they announced the name of their son was X Æ A-XII Musk, 'X' for short.

In a tweet, Grimes explained the meaning behind her son's name.

She wrote: "X is "the unknown variable," she said, while Æ is "my elven spelling of Ai (love &/or Artificial intelligence)."

She continued: "A-12 = precursor to SR-17 (our favorite aircraft). No weapons, no defenses, just speed. Great in battle, but non-violent." (It's possible she meant the SR-71.)

She added that A corresponds to "Archangel, my favorite song."

3. Y was conceived via surrogate

Fans of Grimes and dedicated followers of her social media will have noticed nothing out of the ordinary throughout 2021 on her feeds.

One thing was for sure, Grimes did not appear pregnant at all, regularly posting selfies, artwork and her music. Additionally she was never photographed by paparazzi sporting a baby bump.

This is because Y was conceived via a surrogate, which allowed Grimes and Musk to keep their unborn daughter a secret.

4. Grimes and Musk want more children

Despite the ambiguity surrounding their relationship—Grimes told Vanity Fair she and Musk's relationship was "fluid" and that they live separately while Musk said in a September 2021 statement that they had semi-separated—Grimes shared they have plans to have more children in the future.

"We've always wanted at least three or four," she told Vanity Fair.

Musk is yet to comment publicly on his family's news. Newsweek has contacted Musk's representatives for comment.

Grimes's upcoming album Book 1 will be released later this year.

elon musk grimes daughter
Grimes and Elon Musk attend "Heavenly Bodies: Fashion & the Catholic Imagination," the 2018 Costume Institute Benefit at the Metropolitan Museum of Art on May 7, 2018 in New York City. They recently welcomed their second child, a daughter, into the world. Photo by Taylor Hill/Getty Image