Watts plays Valerie Plame, a CIA officer whose identity was leaked to the press after her husband, Joe Wilson, wrote a critical commentary in the newspaper.
To justify the U.S. invasion, Wilson said the Bush administration twisted intelligence about weapons of mass destruction in Iraq.
"The movie is very accurate in many ways and still, some of those scenes take us back to that, when it was all happening," Plame says.
Wilson, who's played by Penn in the movie, says there's a lesson you'll take away if you see the movie.
"We're all in this together and we all have a responsibility to stand up and be good citizens and hold our government to account for the government's decisions and its actions in our name," Wilson says.
"A friend of ours who has been involved in the film business for some time saw it and said it is this great cross of 'High Noon' meets 'All The President's Men,'" Plame says.
Wilson and Plame now live in New Mexico.
Wilson's company does construction in, among other places, Iraq. Plame now works for a scientific research think tank.