fog/mist photoshop filter

Hi I was taking pics of my baby and wanted to add like a mist or fog around the outside/bottom of the image.
I have had some pro pics of my other children done with this effect.
GHe used a filter on the camera, Iwas after some sort of photoshop filter/brush or something.
Thanks
MATT
I have had some pro pics of my other children done with this effect.
GHe used a filter on the camera, Iwas after some sort of photoshop filter/brush or something.
Thanks
MATT