Britney Spears, an American popular music singer you may be passingly familiar with, is going back on tour--"The Circus Starring Britney Spears"--with a stop at the Honda Center in Anaheim on April 19. It's her first arena tour in five years, her press release kindly informs us.The tour is named after her new album, Circus, in stores (a non-iTunes, physical place where they sell CDs...weird, right?) today. Also today? Britney's 27th birthday! Have a good one, Brit. I'm sure there's many years of