If you seek more Britney Spears, you're in luck. The pop singer is adding another North American leg to her elaborate "Circus" tour to support her already platinum-selling album of the same name, her official website announced today (June 10). Produced by AEG Live, the tour will bring Spears back to Canada and the U.S. for a 20-city run beginning August 20 in Hamilton, Ontario and wrapping in Las Vegas, Nev. on September 27. "I'm so excited to bring The Circus back to North America," said Spears. "I've made some really cool changes to the show that I think my fans are really going to love. I also get to bring the show to some new cities we missed the first time around."