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Eimear Cook lied in her evidence about two meetings she had with Rebekah Brooks, the former editor's defence counsel told the court.
Cook admitted under cross-examination that a meeting at a friend's home had probably taken place in September 2005 - 10 months later than she had initially claimed.
Jonathan Laidlaw QC also questioned Cook's police statement in which she said Brooks had told her about being accused of assaulting her then-husband Ross Kemp.
He told the court: "Mrs Brooks was not the subject of an accusation of assault, or the subject of the police being called until November 2005 ... Not only did it not happen, it could not have happened."
Cook replied: "I did not make it up ... I have no grievance against Mrs Brooks personally."
Eimear Cook told the court that she met Rebekah Brooks - then known as Rebekah Wade - after becoming concerned about press intrusion on her private life and that of her three children.
She said of her meeting with Brooks: "We discussed a lot about public figures, people in the media, in a gossipy, fun way."
"I remember the topic of how easy it was to listen to their voicemails, as long as they hadn't changed their factory settings," Cook continued.
"She told me Heather Mills was engaged to Sir Paul McCartney at the time and she had thrown her ring out of a window, it was in parentheses about phone hacking. I had the impression she was talking about Sir Paul McCartney's phone not having its pin code changed."
Eimear Cook, the ex-wife of golfer Colin Montgomerie, has told the court about a meeting she says she had with former News of the World editor Rebekah Brooks in 2004.
In Cook's recollection of the conversation, Brooks appears to refer to the practice of hacking voicemail messages.
Brooks and the other defendants deny all of the charges against them.
Cook told the court:
The court heard that the meeting took place in September or October 2004 at the home of a mutual friend. The trial continues.