Olivia Newton-John reveals she is in "unbearable pain" as she battles stage four cancer

Since publicly announcing her third breast cancer diagnosis in September 2018, Olivia Newton-John has largely stayed out of the spotlight, choosing instead to take time to focus on her health and her family.

However, over the weekend the Grease star stepped out for the first time in months to give fans an update on her health on CBS Sunday Morning with Gayle King.

The 71-year-old actress has admitted that the pain from her disease is unbearable.

"Crying kind of pain. Tears pain," she told King.

When King asked about her prognosis, the 'Physical' hitmaker said: "Prognosis? I don't discuss prognosis.

"Because, in my opinion, if they give you a percentage or, you know, 'This many women get this and they live this long,' you can create that and make it happen.

"It's almost like, I think I know what the statistics are. But I put them away. I'm gonna live longer than that. I've made that decision."

The iconic Aussie star also explained she can't help thinking about death but she tries not to.

"I try not to but you have to think about it. I mean, it's part of life. And, of course, if you have a cancer diagnosis, your death is kind of there. Whereas most people, we don't have a clue when we're gonna die. And I could die tomorrow – a tree could fall on me. So, it's just that we have that knowledge that we could die.

"But I try not to think about it too much, but I try to meditate and be peaceful about it, and know that everyone I love is there, so there's something to look forward to."

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The 'Hopelessly Devoted to You' singer was diagnosed with breast cancer in June 2017. She also has a tumour in the base of her spine.

In September last year, the star told Sunday Night she had decided to treat this cancer with "modern" medicines and natural remedies.

"I’m treating it naturally and doing really well," she said at the time.

Newton-John was previously diagnosed with breast cancer 25 years ago in 1992, after finding a lump on her right breast.

The 'Psychical' hitmaker - who has a daughter Chloe with her ex-husband Matt Lattanzi - underwent a partial mastectomy and six months of treatment, before getting the all-clear.

However, there was more heartache for the star when she was diagnosed with cancer in her shoulder in 2013 after she was involved in a minor car accident.