Tonight it was Brad Pitt's housekeeper calling the cops after a paparazzo blocked the star's driveway with his car; yesterday brought footage of the disturbing-but-not-technically-illegal hounding of Eva Longoria at an LA hair salon; Monday Britney called the cops to "contain" the paparazzi swarming all up in her driveway. Aggressive hordes of paps are nothing new but why the pronounced viciousness so far this year? Declining returns on the once-daunting Britney Spears economy? Pap desperation to meet ballooning subprime mortgage payments, what?