Spray tans have become a lot more natural looking since a few years ago. I would only ever get one done by a professional and only get a Grade 1 or 2 (3-5 is too full on for pale skin - I like to call it the "oompa loompa look" ).

Get it done a few days before the wedding and shower once a day in the lead up. You won't be full on "Gold Coast" brown, it will just be a natural looking glow.

Also use plenty of moisturiser - it will stop it going patchy when it starts wearing off.