Duplicate your render twice. Put them both behind the main one. Smudge the edges of the first one (on the bottom). Apply a Gaussian blur of about 2.0px to 3.0px to the second one (the one in the middle). Done.
I can't help myself today for some reason..
It's like..I know I'm being a dick, and part of me wants to stop..
But than that little rager voice keeps saying.. "Come on..rage this niglet.."
In this case, I do speak the truth though. As you concur.