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Samantha Ronson, Lindsay Lohan

ODuran/Fame Pictures

Lindsay Lohan either finds Samantha Ronson exceedingly funny or thinks it’s hysterical that we care so much about their relationship.

Because no matter how late the hour or how random the moment, LiLo has been all giggles this summer, laughing it up with Sam from Hollywood to Cannes to New York and back again.

Maybe they’re just enjoying each other’s company so much that they can’t stop smiling. Maybe they’re winking over a giant inside joke. Either way, after her various run-ins with rehab, it’s nice to see Linds finally having a ga...um, happy ol’ time. Check out their miles of smiles in our exclusive photo gallery.