Lindsay Slums It In Venice, Parties With Her New BFF

Lindsay ventured into the decidedly un-Hollywood scene in Venice Beach last night to go to the Stronghold Speakeasy.

She was there with her new BFF Markus Molinari and we're hearing some really interesting stuff about this guy ... like he used to trash talk Linds on Twitter. And he was Katy Perry's best friend until she hooked up with Russell Brand and now she hardly talks to him.

Check him pimping out his former friend to promote his site, MarkusIsTheDrug:



And we also hear it's Markus turning Linds against Sam because he's always hated her.

Look at what he posted about Lindsay on his blog during fashion week (when he clung to Katy -- can you say FREE RIDE?). Have you seen this, Linds? I'm not reading "Joke, Crazy, Mental, Mean, Sad" as a compliment. Are you?:



So is this guy a bad guy? Just who is Markus???