'My Generation' Actress -- Arrested for DUI After Smashing Cop Car

"My Generation" actress Anne Son was arrested this week -- after allegedly going on a drunken joyride through L.A. ... and careening into a parked cop car.

Law enforcement sources tell TMZ, it all went down early Wednesday morning -- a couple of officers had parked their cruiser on a street corner while investigating an unrelated incident ... and Son smashed into the black-and-white out of nowhere.

We're told Son then kept driving -- and the officers on scene had to pursue her car on foot.

According to sources, Son eventually stopped further down the block -- and when police finally caught up to her, they were met with an overwhelming odor of alcohol emanating from Son's vehicle.

Officers administered a field sobriety test -- and Son allegedly blew a .19 and a .20 ... well over DOUBLE the legal limit in California.