Elon Musk, the Tesla and SpaceX CEO and world's richest man

Welcomed twins last year with an executive at one of his other companies,Neuralink.

Musk posted a tweet on May 24 saying "USA birth rate has been below min sustainable levels for ~50 years".

CNN Business could not independently confirm the contents of the documents.

Those documents contain the court's stamp as well as Musk's signature, listing him as the father and Zilis as the mother.

Musk did not immediately respond to requests for comment sent to representatives at Tesla, SpaceX and Neuralink.

Zilis' professional ties to Musk date back to at least April 2016, according to her LinkedIn profile,

She became an advisor to OpenAI. Musk is one of the cofounders of OpenAI,