OK, before this happened the Independent on Sunday said:
"The hearing on Tuesday has been described as the most important select committee session in the history of Parliament.
Committee sources are furious at the suggestion that Ms Brooks will try to close down questioning of her knowledge of hacking while she was News of the World editor by saying she cannot prejudice an ongoing police investigation.
A source said: "If she tries to close down the questioning, the whole world will be watching."
It is understood that the committee has legal advice that as Ms Brooks, and the Murdochs, have not been arrested by officers investigating hacking, they must reveal, under oath, what they knew."
So that's now blown. Can she claim right to silence, or something?