Olivia Newton-John had sad news to share Tuesday.

Back in 1992, the singer was diagnosed with breast cancer. She had a partial mastectomy, chemotherapy, and breast reconstruction. She went into remission and has since been a champion for cancer survivors.

Earlier this month she postponed her nationwide tour due to what she believed to be back pain, but she announced today on Facebook that is was actually a cancer relapse.

"I decided on my direction of therapies after consultation with my doctors and natural therapists and the medical team at my Olivia Newton-John Cancer Wellness and Research Centre in Melbourne, Australia," she wrote.

The singer and actress will undergo photon radiation therapy to treat the cancer, which has now metastasized to the sacrum - a bone in the lower back.

We wish you the best of luck, Olivia.

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