Olivia Newton-John reveals breast cancer has returned

Grease star Olivia Newton-John has revealed she's battling breast cancer again, 25 years after recovering from the disease.

The singer was about to embark on a tour across the US and Canada next month, but has postponed all dates after finding out about her diagnosis.

The sad news was announced in a statement posted on her official Facebook page, which read: 'Olivia Newton-John is reluctantly postponing her June U.S. and Canadian concert tour dates. The back pain that initially caused her to postpone the first half of her concert tour, has turned out to be breast cancer that has metastasized to the sacrum.'

In the statement it was also revealed that Olivia will be undergoing treatment and plans to be back to work and on tour later this year.

https://www.facebook.com/olivianewtonjohn/posts/1577533138926054

'In addition to natural wellness therapies, Olivia will complete a short course of photon radiation therapy and is confident she will be back later in the year, better than ever, to celebrate her shows', the statement read.

'I decided on my direction of therapies after consultation with my doctors and natural therapists and the medical team at my Olivia Newton-John Cancer Wellness and Research Centre in Melbourne, Australia.'

Fans were quick to send their love to the four-time Grammy winner, who's battling the disease for the second time.

One fan wrote: 'This news brought me to my knees. You will overcome this and come out on the other side 'stronger than before'. Sending all the love and light to you, John, Chloe--everyone--that I possibly can. We love you, Olivia!'

Olivia at a breast cancer awareness event in Las Vegas

Another said: 'Prayers and love to Olivia. Health first, then fans. Please take care of yourself. Your fans stand behind you regardless of cancelled shows.'

Others offered support with their own personal experiences, or of loved ones who have survived cancer and still live with it everyday.

'This is not a death sentence. My wife has had almost the same thing happen to her. 1991, then 2012. 30 radiation treatments did the trick this time. She is now cancer free for 5 years', one fan wrote.

'I am also a breast cancer survivor. I was diagnosed at the age of 42, in 2008. Praying for you to have strength and complete healing', a second posted.

Olivia had previously cancelled all meet and greets for her shows in June due to severe back pain, which turned out to be one of the symptoms for breast cancer.

This is the second time Olivia is fighting the disease. The 68 year old overcame her initial cancer diagnosis in 1992, and became a prominent campaigner for breast cancer treatment and research, setting up the Olivia Newton-John Cancer and Wellness research centre in Melbourne, Australia.