Now Paris Is Really Pissed!!!!!!!!

Talk about a smart move. Nicole Richie snuck into jail today to serve her sentence for DUI.

She was booked at the Lynwood Jail, where Paris did her time, at 3:15 this this afternoon. Great move by her lawyer Shawn Chapman Holley.

While all the attention was on Lindsay, no one was watching Nicole.

Nicole is being processed right now. Her photo hasn't even been taken. A Sheriff's guy says she's still being processed.

Nicole was sentenced to four days in the pokey for driving the wrong way on an L.A. freeway while under the influence. She was given credit for 1 day because she was in the slammer for 6 hours after her arrest.

Just 82 minutes after Nicole Richie checked herself into Lynwood jail, she left a free woman. Hard time her ass!

According to the official website of the L.A. Sheriff's Dept., Richie checked in at 3:15 PM and was released at 4:37 PM.

A Sheriff's source tells TMZ Nicole was routinely processed and released according to normal operating rules.

TMZ