Vanessa Macias -- part of the Dating Divorcees team on last season's "Amazing Race" -- was arrested in Texas early Friday morning for driving while intoxicated ... TMZ has learned.
32-year-old Macias -- who came in 4th place on "Race" -- was pulled over by the San Antonio Police Department around 2 AM on October 26. During the stop, officers claim they detected the presence of alcohol.
Macias was arrested and hauled to a nearby station where she was booked for misdemeanor DWI -- and posed for an extremely wide-eyed mug shot.
Macias was released a few hours later after posting $1,000 bond.
A rep for Vanessa tells TMZ ... the former reality star feels extremely remorseful over the arrest.