Porn Star Briana Banks -- Busted for DUI at McDonalds Drive-thru

Adult film star Briana Banks -- star of the classic films "Chinny Chinny Bang Bang" and "Vaggie Burger" -- was arrested for DUI in L.A. this week ... TMZ has learned.

According to law enforcement, Banks -- an AVN porn Hall of Famer -- got into a fender bender with another car around 9 AM on Wednesday.

Moments after the incident, we're told a witness contacted police ... and advised them that Banks may have been under the influence of something at the time of the crash.

We're told cops spotted Briana's car leaving the drive-thru at a nearby Micky D's -- so they pulled her over ... and gave her a field sobriety test.

Banks bombed ... and was immediately arrested for being under the influence of alcohol and drugs.

The XXX star was hauled to a nearby station where she was booked and released. No word if she was allowed to keep the munchies she scored during the fast food run.