According to Elon Musk, Grimes "isn't real."
The 51-year-old billionaire has a 10-month-old daughter named Exa and a two-year-old son named X A-12 with the pop star, whose real name is Claire Boucher. However, he is rumoured to have revealed that he has constructed a "simulation" to act as his "ideal partner."
Journalist Devin Gordon for Vanity Fair believes that Grimes herself told him about the hypothesis.
He clarified: "She continuously assured me that Musk believes she is a fictional character.
That she is a simulation that he made and that serves as his ideal companion in his cerebral cortex.
Even stranger, Grimes concurs with the idea.
Devin has been added to the upcoming docuseries "The Elon Musk Show": "Which, despite the fact that she concurs with it, seems a little strange and perhaps even a little frightening. She claimed that she did feel as though he was the appropriate target audience for this simulation."
The article claims that the on-and-off pair, who have a lot of the same interests, first became friends through a "scary" thinking experiment.
He stated: "They both cracked a similar nerdy joke on the terrifying Roko's Basilisk AI hypothesis, which I don't even understand. She shares all of his interests, and her music is heavily influenced by technology."
Grimes and Elon declared they were "semi-separated" in September of last year, but the singer later acknowledged there was "no genuine word" to characterise their union.
She stated previously: "Although I'd definitely call him my boyfriend, our relationship is quite fluid. We each have our own home. We're close pals.
"We regularly interact with one another. I don't expect other people to comprehend what is going on because it is simply our own thing."