Britney Spears caught the audience unaware when she belted out the Alanis Morissette classic You Oughta Know LIVE at the Circus tour in Greensboro, NC on September 5th, 2009. If you pay close attention, you will notice that the audience totally enjoyed the surprise element. As it is Britney babe knows pretty well how to keep her tour interesting by stuffing some surprise numbers in between the regular stuff.
Best moment: Totally hot!
