Singer, actress Olivia Newton-John has revealed that she has breast cancer again, 25 years after recovering from her original diagnosis.
She has postponed upcoming tour dates after discovering that severe back pain she has been suffering is a result of the disease spreading to her spine.
The 68-year-old was due to perform across the U.S. and Canada next month.
Newton-John said she will undergo a short course of radiation, as well as natural therapies, upon the advice of specialists at a cancer research center named after her in her adopted home of Melbourne, Australia.
Newton-John has been a chart-topper since the 1970s with songs that stretch into pop, folk and country but she became best-known for starring in the 1978 musical comedy "Grease" alongside John Travolta.
Newton-John was first diagnosed with breast cancer in 1992, forcing her to halt her schedule.
The experience had a major impact on Newton-John who became an advocate for research into cancer and for early detection.
Last week, the four-time Grammy award winner cancelled several events for the upcoming tour dates due to "severe back pain."
A statement from her management on Tuesday said: "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."