Sam Hunt's booking photo was just released and the dude looks none too happy to be in police custody -- as fresh details surfaced following his Tennessee arrest.

The country music star posed for this stone-faced mug shot at the Henderson County Sheriff's Office in Lexington, TN, after he was busted for Speeding and Violation of Ignition Interlock Device on January 20.

TMZ obtained a police report with new information about the car stop ... cops say Hunt was behind the wheel of a Ford F250 truck driving over the speed limit as he headed west on Interstate 40 in Henderson County.

Police say a trooper in a patrol car clocked Hunt going 85 miles per hour in a 70 MPH zone before pulling him over and asking for his ID.

While checking his driver's license, the trooper confirmed Hunt was supposed to have a "functioning ignition interlock device" -- which is a portable breathalyzer that measures your blood alcohol level -- according to the police report.

Hunt was then arrested and booked into the Henderson County Jail before he posted $1500 bond and was released.

As you may know ... Sam was placed on probation after he pled guilty to DUI charges in 2021. But, according to court records, his latest arrest did not constitute a violation of his 2021 conviction because he's no longer on probation, nor is he required to use the interlock system.