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Elon Musk welcomed a daughter with his ex-girlfriend, singer Grimes (Claire Boucher) via surrogate.

The 33-year-old Canadian told Vanity Fair that she welcomed daughter, Exa Dark Sideræl Musk, in December.

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Grimes (R) broke up with Musk, 50, in 2021 after dating three years. They share a 22-month-old son named X Æ A-12 (pronounced X Ash A Twelve, or simply Ash.)

The billionaire Tesla founder shares six sons with first wife Justine Musk.

Grimes revealed her baby news to Vanity Fair magazine in a cover story for the April 2022 issue.

Grimes explained her daughter's unusual name to Vanity Fair, telling the mag that Exa refers to a supercomputing term, exaFLOPS, while Dark represents Dark matter "the unknown." She said, "Dark matter is the beautiful mystery of our universe."

"Sideræl" refers to Grimes' favorite Lord of the Rings character, Galadriel, who "chooses to abdicate the ring."

Grimes told Vanity Fair that she was "fighting" to name her daughter Odysseus Musk, because "A girl named Odysseus is my dream." She and Musk ultimately chose Exa Dark Sideræl instead.

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Elon Musk is back on the market. The Tesla founder and musician Grimes have reportedly split after three years together.

The couple will continue to co-parent their infant son X Æ A-Xii, pronounced Ex Ash A Twelve.

Elon and Canadian singer Grimes, real name Claire Boucher, 33, met in 2018. They welcomed their son in 2020.

Grimes is best known for her electronic and synthpop music. She featured pop singer Janelle Monae on her track "Venus Fly."

"We are semi-separated but still love each other, see each other frequently and are on great terms," Elon told Page Six.

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Elon said they grew apart due to his work which requires him to travel extensively.

"It's mostly that my work at SpaceX and Tesla requires me to be primarily in Texas or traveling overseas and her work is primarily in LA. She's staying with me now and Baby X is in the adjacent room."

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Elon, 50, moved to Texas in December 2020 following a public spat with California lawmakers over government shutdowns amid the Covid-19 crisis.

Elon, who has six other sons with ex-wife Justine Musk, was less than impressed with the latest addition to his modern family.

"Well, babies are just eating and pooping machines, you know? Right now there's not much I can do," he told the New York Times. "When the kid gets older, there will be more of a role for me."

Elon has been married three times. He divorced Justine Musk in 2008, and he and actress Talulah Riley divorced twice.

He briefly dated actress Amber Heard in 2017.

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Tesla founder Elon Musk and musician Grimes welcomed their first child together, a boy, on Monday. Musk confirmed the baby's arrival in a tweet. "Mom & baby all good," he wrote.

Grimes, real name Claire Boucher, is a 32-year-old Canadian singer best known for her 2012 album Visions, that spawned the singles "Genesis" and "Oblivion." The album won the Juno Award for Electronic Album of the Year.

Grimes, who admits being a drug-addict-turned vegetarian, met Musk in 2018 after dating singer Devon Welsh for 3 years.

She broke the news of her pregnancy in a graphic photo on her Instagram page. The image showed her bare baby bump with what looked like red lacerations across her belly.