Princess Diana leaked information about the Prince of Wales to "an ally" in the press in order to "take on" her estranged husband, former News of the World reporter Clive Goodman told the phone hacking trial.
Rebekah Brooks says police officers were not paid for confidential information during her six-year stint as editor of the Sun.
"I have never knowingly sanctioned the payment of a police officer for information in the line of his duties," she told the Old Bailey.
"You would not pay a public official unless it was in the public interest," she added. "To pay a serving public officer, it would have to be an incredibly high bar."
Ms Brooks said that she was in a "constant dialogue" with her reporters over how they dealt with public officials.
The ex-News of the World chief texted former PM Tony Blair saying she was 'feeling properly terrified' the day before the police interview.
In contrast to yesterday's cool performance, the former editor broke down whilst giving evidence in her phone-hacking trial.
Tony Blair advised Rebekah Brooks how to shield James Murdoch from the fallout of the phone-hacking scandal, the Old Bailey heard today.