Teen Mom Offered Rehab Instead of Prison

TMZ broke the story ... Amber struck a plea deal with prosecutors in her drug case last month -- a deal that would allow Amber to avoid a 5-year prison sentence by completing a court-mandated drug rehabilitation program. An Indiana judge approved the deal today.

If Amber successfully completes the Madison County Drug Court program, her drug case will be entirely dismissed -- but if she screws up, she'll be thrown in the slammer.

As we first reported, Amber was arrested in December for drug possession and failing to provide a urine sample (a stipulation of her probation).