Maligned Teen Mom all-star Amber Portwood has copped a plea in her probation case and will not be sentenced to five years in prison ... at least not yet.

In jail since before Christmas awaiting trial for felony drug possession case, Ambs cut a deal Friday to avoid spending the foreseeable future behind bars.

Portwood pleaded not guilty to one count of possession of a controlled substance - a medication she had no prescription for - and one probation violation.

In return, she remains on probation and, if she hopes to remain free, must complete the Madison County (Ind.) Drug Court program. Or else.

Her next hearing is scheduled for February 6.

Amber Portwood is on probation following her domestic violence case involving baby daddy Gary Shirley. She missed a probation hearing last month, a big no-no.

When police showed up at her house to check on her, they found the pills in her bag ... and she was unable to produce a prescription. Even bigger no-no.

While she's been in jail and making officials worried that she will shiv someone, Portwood's now-former landlord had sued to have her evicted.

A judge said she is already in the process of moving out, so the lawsuit is not necessary. A separate hearing on that issue is set for March 14.

[Photo: Fame Pictures]