No,Imothep you don't have to buy a new Xbox 360 controller as Nester is said you can use a ds3 tool.
It doesn't have to be motion joy,there is a much better tool called "better ds3".
I used it,it's simple to configure,it's simple to use,but the only problem I can't solve is how to use it wirelessly.
Just search on YouTube on how to configure better ds3 tool.