i think you have to mask it. there should be a button on your toolbar for that. it just makes a clipping mask the same dimensions as the image that you can then apply strokes etc. to.
Add a stroke in the appearance panel. Then apply the effect "outline object" to that stroke.
cool, thanks! both suggestions actually did work, but i went with the outline object so i didn't have more than one piece to keep up with. thanks a bunch, peeps!