Hehe, Interesting isn't it , Well, I don't know legits way to get it, But I know an non-legit one =D
Simply use an advanced class editor / trainer like this one : Trainer Thingy =D
Or this one : MeekaaH's
And edit a class for yas, Give it a slot, And have fun ^_^,
Any questions, Feel free to ask.
Melodia