Exclusive Details

Adrien Broner is behind bars in Ohio -- and will be there for the next 10 days -- to serve his punishment stemming from a previous reckless driving conviction.

Here's what we know ... Broner was sentenced to 6 months probation back in July 2015 stemming from a drunk driving arrest in which he told the officer he was super rich and famous.

He later pled no contest to reckless driving.

But according to court documents, Broner violated his probation in November 2015 -- and was sentenced to 10 days behind bars.

Broner appeared in court this morning -- and pled guilty to probation violation and formally began his 10 day sentence.

He's currently behind bars at a jail in Hamilton County, Ohio.