Actress Sadie Frost asked close relatives, including her mother, to sign confidentiality agreements because she did not know the source of tabloid stories about her, a court has heard.
The Mirror Group has admitted writing 27 stories about her between 2003 and 2006 after hacking her voicemail.
She said it had been a "real relief" to learn years later that those closest to her were not the source of the stories.
Ms Frost, 49, told the High Court "my life was completely interfered with".
She also said she was "shocked" to discover that Mirror Group Newspapers (MGN) had 35 invoices from private detectives who were employed to find private information about her.
Ms Frost, the former wife of actor Jude Law, said her ex-husband had suspected her of selling stories about him to the newspaper group.
It was only in recent years that she realised their phones had been hacked, she said.
Compensation considered
She told the court Mr Law had subsequently told her that if he had not thought that she was selling stories about him there would have been a "good possibility" they would not have divorced.
Ms Frost, who starred in the films Dracula and Love, Honor and Obey, now runs the fashion label Frost French.
The hearing at the High Court in London is considering what compensation should be paid by MGN to eight high-profile figures.
In addition to Ms Frost, they are BBC creative director Alan Yentob, soap stars Shane Richie, Shobna Gulati and Lucy Taggart, former footballer Paul Gascoigne, TV producer Robert Ashworth and flight attendant Lauren Alcorn.
Trinity Mirror, the owner of the Mirror newspapers, has apologised to "all its victims of phone hacking".
All witnesses in the case have now given evidence.
The judge will hear closing speeches from the two sides next week.
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