Lisa Robin Kelly ARRESTED -- 'That 70's Show' Star Busted on Suspicion of DUI

"That '70s Show" star Lisa Robin Kelly was arrested for the millionth time ... this time on suspicion of boozing (and or doping) while driving, TMZ has learned.

Law enforcement sources tell us ... cops responded to a call around 11:30 pm on Saturday night that a car was parked on the 5 freeway, blocking a lane of traffic. That car was Lisa's (allegedly).

We're told when officers arrived they noticed something fishy -- i.e. signs of booze -- and conducted a field sobriety test -- which police say she bombed -- and Lisa was arrested on suspicion of driving under the influence.

As TMZ previously reported (over and over again) ... this is NOT Lisa's first arrest. She was popped back in 2010 for a DUI ... in April 2012 for alleged spousal abuse ... and then in Nov 2012 for assault.

She must really love the color orange.