Robert De Niro’s estranged wife thinks he’s worth $500M and wants half

They married in 1997 and divorced in 1999.
They are arguing over the wording of the prenup they signed when they then remarried in 2004.
A 2004 prenup that his side insists limits her to a $6 million apartment, $500,000 cash and $1 million a year in alimony.
But her side insists the prenup’s language additionally entitles her to half of what he has made during the re-marriage.
Lawyers for his estranged wife demanded half of his “$500 million” fortune.