Robert De Niro is locked in a messy divorce battle with his estranged wife Grace Hightower, who is demanding half of his $500 million fortune. The couple's high-profile split came last year.

They were married – for the second time to each other – in 2004. They also were married from 1997 to 1999.

A prenup was reportedly put in place for the second marriage limiting Grace Hightower to a $6 million apartment, $500,000 cash and $1 million a year in alimony in the event of divorce, according to WonderWall. Now that they have parted ways, Hightower is estimating De Niro's fortune at $500 million fortune and is demanding half of it.

Things got heated during a divorce hearing on Thursday at the Manhattan Supreme Court. Hightower argued that she should receive half of what De Niro has earned since 2004, when the prenup was signed. Hightower’s attorney explained that De Niro's accumulated wealth of $300 million since 2004 was generated from 35 business ventures and 38 movies.

"His total income is more than $500 million. He gets it all, " Allan Mantel, told the judge, according to Page Six.

De Niro's legal team meanwhile argued that Hightower was trying to suck her soon-to-be ex-husband dry, and making a spectacle of the ordeal. Hightower has reportedly issued De Niro with six subpoenas for his financial records.

"She is seeking essentially every piece of paper of De Niro’s receipts for meals on movie sets, wardrobe, payroll records of every employee at Nobu, credit card charges. This all goes back 15 years," said De Niro’s lawyer, Caroline Krauss-Browne.

The couple have a 7-year-old daughter and have been battling over custody but have not released any formal comment on the divorce, Page Six added.