STEP 5
Now go to Filter>Blur>Gaussian Blur. Enter the radius as 8 pixels and press OK to blur the image.
Now I am going to blur the image everywhere but at the center. Note that if you are using Photoshop CS6 than you may use Iris Blur. If you are using Photoshop CS5 or lower than follow the steps. Press and hold Ctrl/Cmd and click on the layer thumbnail of the Vignette layer. This will load a selection.
Your image should like this.
Now go to Layer>Layer Mask>Reveal Selection.