Mindy McCready won't have to face a year in the slammer -- as long as she does 60 days without incident. And there's your rub: MM and "without incident" are like oil and water.

She has to show up at a Tennessee jail at 9:00 AM sharp tomorrow to start serving her sentence, which she agreed to so she could avoid going to trial for a probation violation.

Mindy violated her probation (which she got for prescription drug fraud) by falsifying her probation hours.