Janet Jackson says she is postponing her Unbreakable tour to have surgery. The 49-year-old singer posted a message on her website and social media sites Thursday announcing that all future tour dates had been postponed until the spring. The singer said the tickets will be honored in a special way when the new schedule is announced. She did not release any new dates or details on her medical condition. Jackson had been next scheduled to perform Jan. 9 in Denver.