Elon Musk, the CEO of Space X and Tesla, has secretly had their third kid, called Techno, with his ex-partner, Canadian singer Grimes, according to a new biography on Musk.

As per The New York Times' critique of Musk's upcoming biography, authored by journalist Walter Isaacson and slated for release on September 12, Elon, aged 52, and Grimes, aged 35 (whose legal name is Claire Boucher), celebrated the arrival of their third child, a son named Techno Mechanicus, who is also known by the name Tau.

However, there was no information disclosed regarding the Space X founder's upcoming biography would include further details about the child, such as when and where he was born.

A request for comment from PEOPLE was not immediately answered by either the Grimes or Musk representatives.

The  business magnate and her ex-girlfriend  welcomed son X A-12 on May 4, 2020, whose name was later changed to X A-Xii and is nicknamed "X,"

The former twosome had welcomed their second daughter named Exa Dark Siderael through a surrogate in 2021 who is nicknamed "Y," and after three months they both split their three-year relationship.

It is pertinent to know tha while conversing with Wired last month, Grimes disclosed her co-parenting plans with Musk, adding that they are still figuring out what their children's educational paths would look like.

She revealed, “I really care about having a very good relationship with my kids. I think I understand how to be a good parent to them. Both enforcing discipline and being their friend," she said.

Grimes further added, "Who knows, maybe they’ll resent me and reject family culture, but I feel like they will not."

For the unversed, Musk also has six children with his ex-wife, Canadian author Justine Wilson, in addition to the three children he has with Grimes.