Olivia Newton-John battling her cancer with cannabis

Grease star Oli Newton-John is offering an update on her third battle with cancer and revealing how cannabis has become a key component in her treatment plan.

The singer of timeless hits 'Hopelessly Devoted to You', 'Physical' and many more shared the news last year that she was once again battling breast cancer, after previously being treated for the disease in 1992 and and in 2013.

Last summer, Oli assured fans that she was "feeling great" as she started treatment. One year on, she has given an interview to Australia's Sunday Night programme in which she describes her medical regiment.

The 69-year-old singer and actress is combining radiation therapy with a sugar-free diet and cannabis oil from plants raised by her husband on their own property in California, where recreational marijuana has been decriminalised.

"I'm very lucky to live in a state where it's legal and I have a husband who is a plant medicine man how lucky is that?" she told Sunday Night.

"My dream is that in Australia soon, it will be available to all cancer patients… or any kind of disease that causes pain."

Despite her diagnosis, Oli maintains a positive outlook about her future and is grateful that she has the resources to pursue the best possible treatment.

"By having a focus on other things and not thinking about yourself all the time," she said. "There are other people out there doing much, much worse than me.

"I'm a very privileged person and I'm very aware of that. I live in a beautiful place, have a wonderful husband, all these animals I adore, I have an incredible career — I have nothing really to complain about."