She is now joining up stuttering experts to help determine causes and cures.
Blunt tells NYMag.com, "I'm actually on the board for the American Institute for Stuttering. They honoured me about two years ago, and since then I've really been a very active member for it, because I think they're using revolutionary techniques to help people get through this really anguished struggle of having a stutter."
The Brit wishes she had known about the organisation long ago because it could have eased her suffering, adding, "They've had huge success with the methods that they've used. I wish to God I'd known about them as a kid, because I maybe would have avoided eight to nine years of it not being an easy time... (But) it started to eke itself out; between the age of seven and 14 was when it was really bad. And around 12 it was at its worst. Not an awkward age at all to be unable to speak!"