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Chace Crawford could spend up to six months in jail if he's convicted on his misdemeanor charge of pot possession -- but he's already in the dog house with Mom and Dad.

After his June 4 arrest in a parking lot outside a Plano, Tex. bar, "his mom called him crying," an insider close to Crawford, 24, tells

"He comes from a very good family, and his parents were so upset that his mugshot was everywhere," the insider says of mother Dana and father Chris.

Cops busted Crawford and a pal inside a parked car after they discovered an unlit marijuana joint. Following the incident, another pal insisted the actor was simply in the wrong place at the wrong time: "He wasn't smoking, the pot was in the car, and it was his friend's."

"Ultimately [his parents] did believe him when he explained the joint 'wasn't his,'" the insider adds. "But they were still unhappy to have their son's name associated with drugs."

A third Crawford source explains the family is "upper middle class." Dana and father Chris "weren't strict parents -- just always had high expectations."

Accordingly, Crawford's summer party plans will be extra subdued, the insider says. "Don't expect to see Chace out clubbing anytime soon. He's going to be laying low for awhile after that." See the top 10 habits that improve your appearance.

Plus, the TV star will have a prestigious new big-screen project to keep him busy. Crawford has signed on to star alongside Jane Fonda and Catherine Keener in the indie drama Peace, Love and Misunderstanding, Variety reports.