Olivia Newton-John rubbishes deathbed rumours in New Year video

Iconic Australian actress and singer Olivia Newton-John has rubbished rumours and reports she's deathly ill.

An insider allegedly told RadarOnline that the Grease star was dying of cancer and had "weeks, not months" to live.

Her manager denied the claim several hours later while her niece, Tottie Goldsmith, dismissed it as a "sick" and "distressing" rumour.

Now Newton-John herself has released her own denial.

"The rumours of my death have been greatly exaggerated, to quote a very famous quote," she said in a video posted on her social media.

The 70-year-old went on to reassure fans she was "doing great".

"I want to wish all of you the happiest, healthiest 2019 that's possible. Thank you all for your wonderful love and support - for me and for the Olivia Newton-John Cancer Wellness Centre in Melbourne, Australia."

Newton-John revealed her third bout of cancer in 2017 after being diagnosed twice before.