I am wondering if the Object hides the Photo outside of it's bounds. If this is so then you can create a "Clipping Mask" which 'clips' or hides the outside information.

To make the "Clipping Mask" you would need to have both the object and the picture selected, with the picture in back and then using the menu bar :
'Object-> Clipping Mask -> Create' or you can just press Ctrl(+)7 on the PC or Command(+)7 on the MAC.

If this isn't what you want let's know.