There was a time when Ghislaine Maxwell talked freely and often to Christina Oxenberg, daughter of Princess Elizabeth of Yugoslavia.

But Maxwell, 58, friend and confidante of convicted paedophile financier Jeffrey Epstein, may come to regret her lack of inhibition. For I can disclose that the spirited Oxenberg has alerted the FBI that she is willing to testify against her old acquaintance.

'Anything I can do, I want to do because I'm so disgusted by what has happened,' Christina, 57, tells me from New York, explaining she called an FBI hotline with information about the Epstein case.

Hotline: Christina Oxenberg (left) with Ghislaine Maxwell

Following her approach, she was called by a detective. 'He said he had reviewed my comments and wanted to follow up,' says Christina.

The FBI's interest was understandable. Oxenberg's information included details of a conversation with Maxwell in 1997 in the latter's living room.

'Never forget it. We were alone. She said many things. All creepy. Unorthodox. Strange. I could not believe whatever she was saying was real. Stuff like: 'Jeffrey and I have everyone on videotape!'

ey Epstein and Ghislaine Maxwell attend Batman Forever in 1995

The FBI agent asked if Christina would be willing to testify. 'I said of course I would.'

Oxenberg, sister of Dynasty actress Catherine, explains that she wants to achieve justice for those who were abused by Epstein.

'Nothing will heal the trauma. These women are affected for their whole lives, but at the very least they should have money.' The money in question, she adds, is not just the fortune amassed by billionaire Epstein, but also from Maxwell.

'She definitely has millions,' says Oxenberg, who is publishing her memoir, Secrets, via the website Patreon.

'She wanted to marry him. She didn't, but she got a lot of money. Cash and assets. All blood money.'