Shannon Twins Karissa Will Drive Kristina Charged with DUI

Former Playboy Playmate Kristina Shannon just got a new role ... DUI defendant.

Kristina and former fellow Playboy Playmate/twin sister Karissa were injured when Kristina smashed their Benz SUV. They were en route to get their nipples pierced.

It's Kristina's first DUI, so she'll probably get off with probation.

Both girls like to party together, and drinking is part of the drill.

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Playboy Playmates Shannon Twins Injured in Car Wreck ... Kristina Busted for DUI

Former Playboy Playmates Karissa and Kristina Shannon were rushed to the hospital Monday after a horrific accident where Kristina rolled their SUV ... and then got arrested for DUI.

Sources close to the twins tell us they were on their way to get their nipples pierced (yes, really) when Kristina lost control of their G-Wagon in Beverly Hills. Karissa had to be pulled from the vehicle through the windshield and firefighters cut open the SUV's roof to rescue Kristina.

Law enforcement sources tell us the twins were taken to a local hospital for treatment. Amazingly, they made it out with just scratches and bruises. Kristina was cited for misdemeanor DUI while she was still in her hospital gown.

Sadly, getting wasted in public has kinda become the girls' thing lately.

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'Girl Next Door' Kristina Shannon Stumbling Hot Mess on Sunset After 'Botched' Boob Job

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Former Playboy centerfold Kristina Shannon fell HARD multiple times, and damn near spilled right out of her top during a wasted night on the Sunset Strip.

Our photog caught Kristina mid-tumble as she was leaving the famed Chateau Marmont Thursday night -- and her poor friend was struggling to keep Shannon upright.

One half of the Shannon twins did manage to tell us about her new twins -- she says she got new boobs ... which she proceeded to flaunt, but that's not even the best part of this video.

Watch Kristina attempt to get from the curb to her car. It's epic ... as in #epicfail

The Playboy Twins -- When Sisters Suck Face ...

Playboy Playmates and biological twin sisters Karissa and Kristina Shannon, 20, got a lot closer at the Playboy mansion this weekend ... and shared a tender open-mouth kiss with each other.

It's OK to love your sister ... but is it really OK to LOOOOOOOOVE your sister?