Adrian Peterson was busted for DWI Thursday night in Minnesota ... where the Vikings legend was booked into the county jail, even posing for a mug shot.
TMZ Sports has learned the former league MVP was pulled over at 3:20 AM in an Audi Q5 ... after a state trooper says they saw AP speeding, going 83 in a 55 MPH zone.
The cop suspected Peterson, 40, was drunk ... and when the future Hall of Famer ultimately submitted a breath sample on the scene, he blew a .