Nicole Shanahan is at the center of the Musk-Brin drama

Elon Musk and Sergey Brin argued over Nicole Shanahan, a Silicon Valley entrepreneur and philanthropist

In June, Shanahan and Brin announced they were divorcing after three years of marriage

The Wall Street Journal reports Musk and Shanahan had an extramarital affair this weekend

A spokeswoman for Shanahan did not respond to requests for comment.

They have signed a prenuptial agreement and are currently negotiating their divorce settlement

According to the report, she seeks more than $1 billion 

MacKenzie Scott and Melinda Gates' divorce settlements rival hers.

MacKenzie Scott and Melinda Gates' divorce settlements rival hers.