till the world ends

Britney Spears sure knows how to work fast: Only a few weeks after the release of the music video for her number-one single, 'Hold It Against Me,' the Grammy-winning superstar is already putting on another show -- this time, in the video for her follow-up single, 'Till the World Ends.' Spears has never looked better in this almost-too-hot-for-the-Internet video, in which the leather-clad singer pe