The daughter of "Real Housewives of Orange County" star Tammy Knickerbocker won't spend another second behind bars after being convicted of drunkenly smashing into a bunch of cars and punching a cop.

TMZ broke the story ... Lindsey Knickerbocker got popped in one of the craziest DUIs ever -- not only do cops say was she insanely drunk (she had a BAC of .32%), but she allegedly committed a multi-car hit-and-run too.

And for the topper, she allegedly slugged a cop in the gut.

Now TMZ's learned Lindsey struck a deal ... pleading no contest to 3 charges -- DUI, hit-and-run, and battery on an officer -- and a 4th for driving with a BAC of .08% or higher has been dropped.

Lindsey was sentenced to 3 years probation, 129 hours of community service and a 9-month first offender alcohol program.

She was also sentenced to a single day in jail ... but got credit for time served.

The daughter of "Real Housewives of Orange County" star Tammy Knickerbocker is behind the craziest DUI arrest of recent memory -- after she allegedly rammed several parked cars while super duper drunk ... and then PUNCHED A COP.

According to cops, 23-year-old Lindsey Knickerbocker was popped on December 14 after witnesses told police she had smashed into two parked cars on Balboa Island in O.C.. Witnesses said Lindsey then fled to a friend's house nearby.

When police followed Lindsey to the house, cops say Lindsey punched one of the arresting officers in the stomach. Lindsey was promptly placed under arrest.

Now the insane part -- according to court docs, Lindsey is accused of having a blood alcohol content of .32% at the time of her arrest ... FOUR TIMES the legal limit in California.

Lindsey has since been charged with four crimes -- DUI, driving with a blood alcohol content of .08 or higher, hit-and-run, and battery on an officer.

She's due in court next month. Attempts to reach Lindsey were unsuccessful.