Justin Bieber -- Victorious in $9 Million Deafening Scream Lawsuit

Hear ye, hear ye ... Justin Bieber just scored a massive victory in his $9 million legal battle over a woman's busted ear drums, TMZ has learned.

We broke the story ... Stacey Betts filed a lawsuit against Bieber last summer, claiming she attended a concert with her daughter in 2010 -- and Bieber incited the crowd to such a frenzy, the volume of the screams gave her permanent ear damage.

Stacey wanted $9 million in damages -- but last week, she filed documents asking to dismiss her case.

Stacey says she doesn't have a lawyer -- and moving forward with the case on her own is damn near impossible. Nevertheless, she says she still believes in the merits of her case.