There is a lot of discussion these days around what is the "first look". For many couples its a staged moment where the couple see each other for the first time, all dressed and ready for the ceremony.
This can make an beautiful moment where you see each other or just touch hands from around a door.
It can be the moment your partner walks into the church or around the corner into the line of sight of the awaiting other half. There is usually a tear in their eyes or at the very least a HUGE smile. I have even had partner have to look away to stem the emotion of that moment.
Its a beautiful shot to capture one partner looking adoringly at the soon to be, just moments before they are to become, married