Britney Spears fought her way through a mob of people, smartwater in hand, to get into her beloved Bally's this afternoon. Gotta keep up her end of the bargain if she's going to end up as their spokeswoman. After having to pony up $400,000 to all those lawyers, a good workout sounds like just the ticket to blow off some steam. Hey, it's a lot better than her old form of stress release — hitting the clubs every night.