Paris Hilton to Lindsay Lohan -- 'No One F***s With My Family and Gets Away With It'


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Paris Hilton has a message for Lindsay Lohan -- and the guy who allegedly put Paris' younger brother in the hospital this week after beating him down -- WATCH YOUR BACK!!!!


Barron Hilton posted a photo of his jacked up face on Instagram Saturday -- showing the aftermath of his brawl with a guy he claims punched the crap out of him at LiLo's request ... and it fired Paris up.


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Paris commented on the pic saying, "They both will pay for what they did. No one f***s with my family and gets away with it!!"


And she even added TWO hot-head emoticons to show she means business.


For what it's worth -- Lindsay and her dad deny she had anything to do with the incident ... even though there's video telling a different story .


The not-so simple life.