Olivia Newton-John reveals breast cancer has returned after 25 years

Olivia Newton-John has revealed her breast cancer has returned - 25 years after she beat it.

The singer and actress, 68, has postponed her upcoming tour dates in the US and Canada while she undergoes treatment.

Last week, the Grease star cancelled meet-and-greet events for the concerts due to "severe back pain".

A post on her Facebook page said the pain "has turned out to be breast cancer" which has spread to her lower back.

"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 post added.

A statement from the star said: "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."

Those with tickets to her tour are advised to contact venues directly for refunds and assured updates on the events will be shared within the next few weeks.