Tailing Britney Spears isn't easy and last night, it turned dangerous for one paparazzo. Several cars were chasing the beleaguered pop singer about a mile from the Beverly Hills Four Seasons Hotel yesterday when one of the cars hit a "spotter" (someone who tips off photographers) who was on a motorcycle. He was thrown off his bike and transported to Cedars-Sinai Medical Center, with reports that he was seriously injured. This isn't the first time a paparazzo got injured on the Britney beat. Last month, one photog had his foot run over by the singer's car. Ouch!