Montana Millz was doing everything he raps about.

Unfortunately, the Feds were watching.

The Rhode Island spitter, who's known for the tracks "Sell Drugsz" and "Feds Watching," was just sentenced to three years in federal prison after pleading guilty to six counts related to drug trafficking.

The Feds did do more than just watch his videos on YouTube.  Millz sold 22 grams of fentanyl and two grams of heroin to an undercover officer and then a search of his home found a bunch more fentanyl.

In August, Millz pled guilty to unrelated but similar charges in Pennsylvania. The 30-year old hasn't been sentenced there yet, but it looks like he'll be spending enough time locked up to come up with some good prison ballads.