Amanda Bynes’ ‘All That’ Costar to Attend Conservatorship Hearing

Amanda Bynesformer comrades-in-arms of “All That,” Leon Frierson and Christy Knowings make sure he knows they still love him – express their support – and Leon even gets to court for his conservatory hearing.

Leon tells TMZ … he’s at the Los Angeles Courthouse this Tuesday, March 22nd – and we’re told that Leon got Christy involved in supporting Amanda as well.

Although Christy can’t be there in person – she has auditions – she says, “If it were me, I’d like people to support me. Amanda is a very different person today than we all are.”

Christy admits she and Leon haven’t talked to Amanda in years, but also says they’ve never forgotten her. In fact, one could say that Leon and Christy have been inspired by him.

They both do a true show called “Child Star Reboot” … a kind of “where they are now” look at the young actors. In addition, Leon hosts the “Prime Nostalgia Podcast,” which sheds light on many of the problems Amanda faces.

Christy says they have no ulterior motives for public support – they just want Amanda to know they really care about her. As he said, “I know Amanda is a sweet person and I loved working with her.”

As you know, Amanda was placed in the conservatory in 2013 after strange episodes. He has since received support for attending AA and has been sober for several years.

He submitted the documents in late February to end his 9-year conservatory termand the judge is expected to make a decision at Tuesday’s hearing.