Albert L. Ortega/WireImage
06/10/2009 AT 04:50 PM EDT
To keep their divorce
as private as possible, Mel Gibson and his wife have agreed to keep their financial records under seal, court documents show.
The agreement – signed off by the former couple, their lawyers and a judge – states that depositions, tax records, and accounting information will be all be kept private. Part of the reason for the sealing is because the ex-couple does not want to jeopardize their assets by revealing business affairs and to protect their 10-year-old son Thomas, reads the document filed June 5 in Los Angeles.
With Mel Gibson's estimated net worth at close to $1 billion, the divorce is expected to end with the biggest cash payout
in Hollywood history. Because there's no indication the ex-couple had a prenup, Robyn, 53, is legally entitled to half of everything Mel earned during their 28 years of marriage.
Gibson, 53, recently announced his girlfriend, Oksana Grigorieva, 39, is pregnant
. The baby news isn't expected to affect legal proceedings. Experts say the Gibsons' divorce will likely end quietly in a matter of months.