Ghislaine Maxwell has secretly married and is refusing to reveal the name of her spouse, New York prosecutors said during her bail hearing this week.
The British former socialite, 58, is being held in a New York jail on charges of alleged sex crimes including trafficking a minor and perjury.
She has pleaded not guilty to all the charges against her.
On Tuesday, she was denied bail as she was deemed a flight risk and the shock detail of her marriage was revealed by prosecutors who claim she is hiding the extent of her wealth.
"In addition to failing to describe in any way the absence of proposed cosigners of a bond, the defendant also makes no mention whatsoever about the financial circumstances or assets of her spouse whose identity she declined to provide to Pretrial Services," Assistant US Attorney Alison Moe told Manhattan federal court Judge Alison Nathan during a video conference.