4 Days For Nicole Richie

TMZ was in L.A. County Superior Courtroom moments ago, where a pregnant Nicole Richie faced the music for her wrong-way DUI bust in December -- her second DUI conviction in 4 years. Just like her "Simple Life" co-star Paris Hilton, a judge sentenced Richie to serve time in County Jail -- but only four days -- she has been credited for six hours of time served. Richie was also fined $2048 and was ordered back to school for 21 days to an alcohol education course.

Richie must report to serve her time by September 28th.

The commissioner issued Richie a stern warning, telling her if she she drove drunk again and she actually killed someone she could be charged with murder -- not manslaughter. That's because after her first DUI, Richie agreed that if she drove under the influence and killed someone, she'd be nailed for murder

The 25-year-old is expected to give birth sometime in January.