"16 and Pregnant" star Lindsey Harrison just had a huge victory in court -- she's been awarded all parental rights to her 5-year-old daughter.
Lindsey, who's 21 now, got a managing conservatorship over her daughter, Aniyah Monroe Harrison-Ponce.
According to legal docs ... Aniyah's birth father, Forrest Dean Ponce, has been absent for 6 months, and failed to support his daughter for at least a year.
The judge's ruling officially terminates Ponce's relationship with Aniyah. Lindsey also gets to change her daughter's last name to her new married name ... Nicholson.