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'Jersey's' Sammi

Off Hook for

Punching Ronnie

1/26/2011 7:00 PM PST BY TMZ STAFF

She coldcocked Ronnie with a HAYMAKER on an episode of "Jersey Shore" -- but  Sammi Sweetheart ain't facing the same fate as "Teen Mom" Amber Portwood ... in fact, she's off the hook completely ... for now.

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It was a pretty shocking promo for this week's episode -- Sammi slugs Ronnie across the jaw during an argument ... an act of violence nearly identical to the thrashing Amber Portwood unleashed on her baby daddy just a few months ago ... the same thrashing that landed her behind bars.

As we previously reported, Amber was charged with felony domestic violence over the on-air beatdown -- but according to the Chief of Seaside Police, Sammi won't be prosecuted whatsoever ... at least until Ronnie decides to press charges.

Calls to Ronnie's rep weren't returned -- but seeing as the footage was shot last summer, we're guessing he's moved on. Meanwhile, Amber still faces three years in prison.

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