Madonna got in some final work out time before her big performance at Saturday's Live Earth event. We're super excited to see the show with its already incredible line-up and possible surprise appearances . NBC will be broadcasting a 3 hour special featuring highlights from all the concerts around the world, while Bravo will air 18 hours of live coverage from the huge event. The whole thing will also be streaming live on MSN online . So we want to know, will you be watching?