Its always good to keep a constant eye on what is happening around you. This will enable you to grab candid shots of the guests.
I had just taken the same image she is about to take! Now it was her turn to grab the shot, so by slowly moving up behind her I could take the shot that she was taking on her cell phone.
Of course, the bridal party are keen for the formal portraits, but grabbing candid images like this one adds to a great variety in the wedding album.