Keira Knightley finds it important to be up to date with the news, but after the birth of her second child, she stopped doing it herself.

"I'm addicted to the news," the 34-year-old actress tells Sky News. "Six weeks ago I gave birth to my daughter, so now I follow it much less. It is nice not to know everything."

Knightley will soon be seen as whistleblower Katharine Gun, in the event-based film Official Secrets. Gun worked as a translator at the British secret service in 2003 when she decided to leak secret documents to the press.

She had found out that the United States and the United Kingdom wanted to put pressure on members of the UN Security Council in an illegal way, so that they would agree with the invasion of Iraq.

"Important to be as involved as possible"

Knightley says that she herself would probably not be as brave as Gun, but that she finds it important to know what is going on in politics.

"Politics is about what's happening around you, and about the society you want to live in. So it's important to be as involved as possible."

"Unless you have just had a baby," she adds. "Then you just have to feed your child and try to sleep." According to Knightley, for now she is keeping a close eye on old seasons of The Great British Bake Off.

Official Secrets will be in the cinema from Thursday 24 October.