Celebs in Jail and "Overcrowding"

Another thing that doesn't make sense.....if a "celebrity" is sentenced to a jail for say, 90 days and is confined to an isolation cell....why is that celeb. released after only a couple of weeks due to "overcrowding"? How can that isolation cell be overcrowded? It's not as though that celeb was put into the general prison population.....hmmmm.