Cynthia Nixon kept her breast cancer battle hush-hush from the public when she learned of her diagnosis two years ago, but one person who was aware of her secret fight was Sex and the City co-star Kristin Davis.

"I kept it very quiet. I told Kristin because she happened to be at my house," the actress reveals to Extra.

Recalls Kristin, "She sits me down in Cynthia fashion and says, ‘I have something to tell you. I have breast cancer.’"

The news was a shock to the brunette, who was unable to sit down afterwards. "She stood up in her chair," Cynthia recalls. "I couldn’t get her down until I told her everything I was doing and assured her everything was going to be okay."

The Emmy winner went about her treatment, which included a lumpectomy and radiation, quietly and is now celebrating her one-year anniversary of being cancer-free.

After revealing her battle on Good Morning America last month, Cynthia, 42, announced plans to work with the Susan G. Komen for the Cure breast cancer foundation.

”I want to help Susan G. Komen for the Cure educate the 1.1 million women around the globe who face a diagnosis each year," she said.

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