Britney Spears [1] is amping up to perform her new single, "Pretty Girls," [2] with Iggy Azalea at the Billboard Music Awards, and now she has a lot more to be worried about than nailing new choreography. On Tuesday, the singer appeared on The Ellen DeGeneres Show and explained how she hurt her angle [3] during her Las Vegas concert last Wednesday. Watch the video above to see Britney address the spill in a totally Britney way, and then catch up on the latest viral videos [4].