If your wedding – service and reception – is at a venue it is a good idea to cut the cake straight after the service. The guests can then nibble on the cake while you are having your photos taken. This will keep them occupied without getting anxious about your photo session.
However, please do not use the photo shoot time for the cake cutting. Make sure you have allocated adequate time for the photo session. Don’t skimp on you photo time!!! Those are your memories!!