The zombie onslaught of MTV's reality slop show The Hills is apparently unstoppable. It will be trundling on for a fourth season, a 19-episode run, detailing how they spent their summer vacations (as opposed to their winter, spring, and fall vacations), that will start in August. That leaves us just a short four month reprieve from the gurgling gaggle of gregarious girls. Don't let them bite you. [Us]