Olivia Newton-John reportedly has weeks to live as she struggles to overcome her third bout of cancer.

Newton-John was diagnosed with breast cancer in June 2017.

She also has a tumour in the base of her spine. It is the Grease star's third cancer in her lifetime, but she has managed to successfully overcome it twice.

Olivia Newton-John looks on during the annual Wellness Walk and Research Runon September 16, 2018 in Melbourne, Australia. Photo / File
Olivia Newton-John looks on during the annual Wellness Walk and Research Runon September 16, 2018 in Melbourne, Australia. Photo / File

A report claims the 70-year-old's health has rapidly deteriorated, but she is "clinging on to life" so she can see her daughter Chloe Lattanzi get married in early 2019.

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"Olivia's bodily functions appear to be shutting down, but she refuses to let go until she makes it through Chloe's wedding day," a source allegedly told Radar Online.

The star lives on a ranch in California with her husband John Easterling, where she is reportedly planning to spend her final days.

Another news site, Now to Love reports people close to the 70-year-old say she is struggling to fight off her latest cancer and her prognosis is now "weeks, not months".

In September, Newton-John told Sunrise presenters David Koch and Samantha Armytage: "I'm treating it naturally and doing really well."