As we reported, the judge issued a tentative ruling on Monday, saying that the conservatorship was "no longer required" ... and now it has been made official, at today's hearing.

Amanda's attorney, David A. Esquibias, tells us, “Amanda appreciates the love and support of her fans during this time. She thanks her family for never giving up. Now that the conservatorship has ended, she looks forward to completing her bachelor’s degree and living her life.”

The former child star filed the docs in L.A. in February ... asking for her mother to no longer serve as Amanda's conservator.

Amanda was placed under conservatorship back in 2013, when it became clear that she was struggling with her mental health. She had a string of bizarre episodes, including one when she set her neighbor's driveway on fire. AB attributed the episodes to bipolar disorder and also opened up about her addiction to Adderall ... but has since gotten help.

Amanda says, she's been sober for several years now, and she surely seems to be doing a whole lot better. She's gotten a degree from Fashion Institute of Design & Merchandising and has also gotten engaged to her fiancé, Paul Michael.

On top of all her progress ... Amanda's petition for personal freedom was supported by her mom and dad ... so, this result comes as no huge surprise but is still a big win for AB.

Now, she's free to live her life and we know she has some big plans are in the near future ... like getting a place with her soon-to-be hubby.

Amanda's didn't appear in court, but her "All That" costars Leon Frierson and Christy Knowings showed up to support.