Elon Musk and Grimes have a third child, according to a new biography about the billionaire tech entrepreneur.

In a review of journalist Walter Isaacsons forthcoming tome about the Tesla CEO, The New York Times revealed Musk and Grimes are parents to a son named Techno Mechanicus, whom they call Tau.

Representatives of both Musk and Grimes did not immediately return HuffPosts request for comment.

Musks third child with Grimes, given name Claire Boucher, makes him a father of 11.

He fathered six children with his first wife, Justine Wilson, before welcoming son X A-12 with Grimes in May 2020. The pair had daughter Exa Dark Siderl, whom they call Y, via surrogate in late 2021.