"Jersey Shore's" Ronnie might have some serious 'splaining to do -- cause dude was super close to some chick in a bar this week who wasn't his girlfriend Sammi "Sweetheart."
Anthony Pisciotto Jr., owner of OnCampusDrama.com, shot these pics of Ronnie oozing his Ron Ron Juice all over a couple of non-Sammi guidettes on Long Island.
TMZ spoke with a rep from the bar -- the Dublin Down Tavern -- who confirmed Ronnie was there on Tuesday hosting an event ... but his GF was nowhere to be found. No word on who the mystery woman is.
FYI -- Ronnie's Facebook profile still says that he's in a relationship. Check back tomorrow.
Never fall in love on the "Jersey Shore."
UPDATE: Apparently Ronnie and Sammi broke up during the taping of the "Jersey Shore" reunion show, which aired last night ... looks like it didn't take long to move on.
Jersey Whore --
Ronnie Gets With Other Woman
1/22/2010 7:05 AM PST BY TMZ STAFF
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