The relationship between Grimes and Elon Musk has had an interesting back story and this pregnancy proves to keep surprising fans over and over as time goes on. Electronic musician, Claire Boucher, known to her fans as Grimes started her relationship with Elon Musk keeping things undercover. The world heard of their relationship just hours before they appeared together on the red carpet at the Met Gala in 2018. Elon Musk, is the C.E.O. of the electric-vehicle company Tesla and the aerospace company SpaceX.