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Samantha Ronson usually keeps her mouth shut around the paps - but over the weekend, we caught her dropping every four-letter word in the book!

Samantha got pissed at the paps when they caught her returning home Saturday evening, snarling at them to "f*ck off" and hurling every other expletive she could bring to mind at the paps. Her disposition certainly didn't get any sunnier when we asked her about those rumors, either!

What could have put Sam in such a sour mood? After all, she seemed OK a little earlier in the day...