Britney Spears is leaving no stone unturned in her bid to make the second leg of her North American tour a memorable affair. According to a recent post on Britney’s website, the Comeback Queen has added One Call to the lineup of opening acts for The Circus Starring Britney Spears tour.

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.

Britney’s North American tour starts August 20, 2009. She will cover 20 cities with a total of 22 shows under her belt this time. I think now we can safely pronounce that Britney’s Circus is on a roll!464548