Vicky Pryce told Southwark Crown Court that Chris Huhne made her take the speeding points in a "fait accompli" in 2003. She first revealed the offence to Sunday Times Political Editor Isabel Oakeshott in March 2011.
Pryce told the court that the revelation got Ms Oakeshott "excited" as she planned how to run the story in the newspaper. The pair agreed that the claims would be made through an interview with Pryce, and an agreement was put in place in a bid to protect her.
But Pryce told the court she was shocked to see the story on the front page, and that it included details which could reveal her as the person who took the points.
More top news
A mother and her four young children who are feared to be travelling to Syria are being sought by police.
Hangovers cannot be prevented, even by drinking water or eating after boozing, scientists have concluded.
Striking rail workers and engineering works are set to cause a headache for many Britons travelling over the bank holiday weekend.