Anastacia has undergone a double mastectomy.
The 45-year-old singer battled breast cancer in 2003 and was given the all clear, but the disease returned earlier this year.
She has now announced she decided on the operation while being treated for cancer this year.
"In light of Breast Cancer Awareness Month I wanted to take the opportunity to support a cause particularly close to my heart," she said in a statement.
"I was diagnosed with breast cancer for the second time earlier this year and am currently in the final stages of recovery after undergoing a double mastectomy.