Tonight at the Met Gala 2018, the most unexpected duo made an appearance: Grimes and Elon Musk. Claire Boucher and the SpaceX CEO/Tesla co-founder arrived together on the red carpet. Musk told reporters that he helped design Grimes’ dress. While she appears to be wearing a Tesla necklace, Musk later clarified that the piece has nothing to do with Tesla. Musk described their outing together as a “date night.”

Earlier today, Page Six reported that the two have been dating. When reached for more information, Grimes’ representative offered Pitchfork no comment.

Musk is a fan of Boucher’s music—back in March, he tweeted a link of Grimes and Janelle Monáe’s “Venus Fly” music video, saying, “Best music video art I’ve seen in a while.” The two have since been tweeting back and forth, joking about comets and discussing Post Malone’s Beerbongs & Bentleys.

Musk and Boucher allegedly started talking when he saw she beat him to a “Rococo Basilisk” joke—a mashup of the baroque 18th century European style and artificial intelligence thought experiment Roko’s Basilisk.

For what it’s worth, these are Musk’s favorite Grimes songs:

This article was originally published on Monday, May 7 at 9:51 p.m. EST. It was last updated on May 8 at 11:36 p.m. EST.