Farrah Abraham Strikes Plea Deal in DUI Case -- NO JAIL

"Teen Mom" turned porn star Farrah Abraham won't serve a day behind bars for DUI ... assuming the judge approves a plea deal she just struck with prosecutors, TMZ has learned.

An official at the Douglas County D.A.'s Office tells us, Farrah has agreed to plead guilty to aggravated DUI on June 20th ... in exchange, prosecutors agreed to ask for probation instead of jail.

As we reported, Farrah was popped for DUI in Nebraska back in March ... allegedly blowing a .147 ... nearly twice the legal limit. Farrah originally pled NOT guilty.

In addition to probation, prosecutors will ask the judge to suspend Farrah's driving privileges and order her to pay $500 in fines ... but that's it ... zero time in the pokey.