In May 2018, Musk arrived at the annual Costume Institute Gala at the Metropolitan Museum of Art alongside Grimes, the Canadian singer and producer. At the time, Page Six reported that the pair had been "quietly dating" for a few weeks.
The couple met over Twitter when Musk was planning to make a joke about artificial intelligence and discovered Grimes had beaten him to the punch.
In January 2020, Grimes posted a partially nude photo to her Instagram and Twitter accounts that showed her pregnant with a fetus Photoshopped on her belly. She later confirmed she and Musk were having a baby, who was born on May 4.
The couple named their son X Æ A-Xii, which is partially a reference to a CIA plane nicknamed "Archangel."
In September 2021, Musk told Page Six that he and Grimes had broken up. He said that the two were now "semi-separated" but still loved each other and "are on great terms."
Grimes revealed in a Vanity Fair profile in March 2022 that she and Musk had had a second child conceived through a surrogate named Exa Dark Sideræl Musk (but they call her simply "Y").
Ben Gilbert contributed to an earlier version of this story.