There are unlikely couples, and then there is Elon Musk and Grimes.

The multi-billionaire entrepreneur, investor and engineer has reportedly been 'quietly' dating the Canadian musician according to Page Six, and indeed they made their red carpet debut together at last night's Met Gala (see last pic, below).

The pair reportedly met about a month ago online, after Grimes reportedly made a joke about AI three years ago (in a music video) that Musk had been intending to make himself, relating to thought experiment Roko's Basilisk. Grimes had a character in her video for 'Flesh Without Blood' called 'Rococo Basilisk' that apparently appealed to the 53rd richest person in the world.

"Elon was researching the idea of joking about Rococo Basilisk, and when he saw Grimes had already joked about it, he reached out to her,” a source said. “Grimes said this was the first time in three years that anyone understood the joke. They were both poking fun at AI.”

The couple have been publicly tweeting flirty in-jokes for the past few weeks, but it aaaaaall makes sense now. But Hank Scorpio, Grimes? Really? Also, are you aware that he wants to die on Mars? Think about this before you get into it, girl.

Of course, Twitter had all the jokes...