LOS ANGELES -

Nicole Richie was released from jail Thursday after serving 82 minutes of a four-day sentence for driving under the influence of drugs.

The reality show star, who checked into jail in this Los Angeles suburb at 3:15 p.m., was released at 4:37 p.m. "based on her sentence and federal guidelines," Los Angeles County Sheriff's Deputy Maribel Rizo said without elaborating.

When asked whether Richie, who is four months pregnant, spent her brief sentence in a jail cell, Rizo replied: "I have no further comment."

Under a federal court mandate to manage jail overcrowding, arrestees sentenced to 30 days or less for a nonviolent offense are usually released within 12 hours, the sheriff's department said in a statement.

Under the guidelines, Richie was "treated in the same manner as other inmates with a similar sentence," the statement said.

Richie, 25, was originally sentenced to 96 hours in jail, but that was reduced to 90 hours because of time served when she was arrested.