Ladies, do you know what today is:

Americans are being asked to wear crimson, scarlet or apple-red today in support of the American Heart Association's annual Go Red for Women campaign.

National Wear Red Day is now in its 10th year. It's aimed at raising awareness of heart disease, which is the leading killer of women.

Across the country, landmarks and buildings will be dressed in the color, starting with the Macy's Herald Square building in New York City, which went "red" last night.

** 43 million women in the U.S. are affected by heart disease, but only one in five women believe heart disease is her greatest health threat.

** One woman dies from heart disease each minute and 9 out of 10 women now have one or more risk factors for heart disease.