'Pawn Star' Chum Lee -- I'm Going to Become a Transgender

Chaz Bono has proven to be an inspiration to the guys over at "Pawn Stars" ... at least when it comes to a Halloween costume.

TMZ has learned ... Chum Lee will transform into Chaz for one of his Halloween parties this year ... chin strap and all ... and he's totally fired up about it.

Don't worry -- we're already working on getting the pictures.