Socialite Nicole Richie has been sentenced to four days in jail in connection with her second DUI arrest.

A court commissioner sentenced Richie to serve four days in the City or County Jail (her choice!) — she got credit for a fifth day, for the six hours she served after being busted.

Richie was also fined $2,048, was ordered back to school for 21 days to an alcohol education course and on three years probation.

Richie must report to serve her time by September 28.

She is due in January with her first child.  Her fiance Joel Madden accompanied her to the courthouse proceedings.