Accused lesbian Lindsay Lohan was caught smooching Calum Best (pictured above) at Wednesday’s Nylon Magazine party.

“This isn’t a serious relationship,” one friend tells us. “He’s a piece of shit. He’s a wanna-be celebrity. Lindsay trusts people until they hurt her,” a “friend” tattles to the tabs in NYC.

“She was lifting up her skirt, and sending people over to [her friend, deejay] Samantha Ronson when she didn’t like what she was playing,” says a spywitness causing some partygoers to question whether the “Georgia Rule” star was sober.

“Tenjune has a very strict underage nondrinking policy,” insists a club rep. “[Waiters] only served Lindsay Lohan POM and water.”