VIDEO : Olivia Newton-John Announces She Has Breast Cancer Postpones Upcoming Tour

Olivia Newton-John, Australian songstress and star of movies such as Grease and Xanadu, has announced that she will be ?reluctantly? postponing her early-Summer tour dates due to a breast cancer diagnosis. In a statement on Facebook, Newton-John and her team explained that she will be turning to natural wellness therapies and radiation in the short term to get her healthy again. This isn?t Newton-John?s first battle against cancer, as she previously had a mastectomy due to a previous breast cancer fight in the early 90?s.