The pair were stopped at 12:24 a.m. Tuesday by a Scottsdale police officer for a minor traffic violation, according to police spokesman Sgt. Mark Clark.
The couple was "cordial and cooperative," said Clark. After Officer Rich Holibaugh thought he smelled alcohol in the vehicle, Vaughn was issued a field sobriety test, but was determined to be under the legal blood-alcohol limit of .08 percent.
On the officer's suggestion, Vaughn and Aniston left their rental car in a lot and had a friend pick them up. Vaughn's rep had no comment on the incident.
Between room service and spa treatments – Aniston indulged in a $200 hot stone massage, while Vaughn had some relaxation sessions of his own – the pair, who costar in The Break Up, hit the gym and rode golf carts around the resort's grounds.