Is Kilala Princess the manga really done? If so can anyone tell me how it ends? (spoilers welcomed) It was released where I'm from, but not they've stop releasing out the books.

you can just check the series info, i'm pretty sure there's a series completion status thing somewhere

The series is completed.

Kilala ends up with Rei as the seventh princess and lives with him in Paradisos after killing Rei's evil butler.