Smoke and Mirrors...
Basic steps:
1. Create new blank layer
2. Add "layer mask"
3. Hit "q" for quick mask
4. Select Gradient tool
5. Hit "d" for default tool to black and white
6. Select the "cylinder" gradient effect
7. Create the gradient you want, with the starting point being the focal point and moving the plane of focus a short distance
8. You should see the gradient mask in red over the image, the red bit will be "no blur", the clear bit will be blurred
9. Select the background layer and the select the RGB channel
10. Go to "Filter >> Blur >> Lens Blur" and select the Depth map to be "mask" or similar. Edit the blur to taste
11. Play about with the Levels to taste and make it look like a model
12 Final Saturation boost to give it that plastic look.