SYDNEY - Olivia Newton-John, the Australian singer who found worldwide fame in the hit movie "Grease", has revealed she has been diagnosed with cancer for the third time.

The 69-year-old told Australian television broadcaster Channel Seven that doctors had discovered a tumor at the base of her spine.

She has since undergone radiation treatment, and is also treating the disease with natural therapies.

"I'm still treating it, and I'm treating it naturally and doing really well, yeah," she told the network Tuesday from her home in California.

Newton-John was diagnosed with breast cancer in 1992, but beat the disease. In 2013, she found out that she had cancer in her shoulder.

The entertainer said she has moments of despair, but is keeping positive.

"There are moments. I'm human. So if I allow myself to go there, I could easily create that, you know, big fear," she added. - AFP