Would be easier to just make the background from scratch. Looks like a blue background with a heavily feathered star pattern.
I'd go so far as to say it couldn't be done. Not without looking like a dogs dinner at least. And so easy to knock up from scratch as Curt says. Have a hunt for 'Flare brushes by Karl S 2'. There you go, I've done it for you. These will give you a good start, but you'll probably need to use some Free transform to change the aspect ratio, and Gaussian blur for the feather. The background can be done with a gradient fill.