According to her official site, "Pop group One Call has just been added to the lineup of opening acts for The Circus Starring Britney Spears tour. One Call will join Ciara and Kristinia DeBarge in opening for Britney at the first nine shows of her upcoming North American tour."

For more information on One Call, visit  their site and check out the video below:

If you haven't bought your tickets to the newest tour dates, head over to Brit's site!