Today (October 29) Pollstar confirmed the tour will now launch November 1 at the Nationwide Arena in Columbus, Ohio. The Washington, D.C., concert has been rescheduled for December 21.

Two more dates have been added to the tour – December 1 in Atlantic City, N.J., and a second show in Boston on December 11. Additionally, Spears’ New York City performance at Madison Square Garden has been changed from December 4 to the 5th.

O-Town opens on all dates except December 11-16, when LFO fill the warm-up slot.

The tour now starts the same day the trailer for her first feature film, “Crossroads,” debuts in theatres. The flick is due out next year and tells the tale of three high school girls – a cheerleader, a straight-A student (played by Spears) and a “burn out.” The small-town Georgia gals are on a cross-country trip when they meet a musician who talks them into going to L.A. to compete in a music contest.