I hate to sound like this, but... spare us Sista!!! YES YOU CAN cut out the booze and still go to the bachelorette parties. Pro atheletes and models do it ALL the time, as do I (I choose to be an abstainer). If you want to drop the weight bad enough, you'll do what it takes. If you don't want it bad enough... well... you better find a good seamstress to let those dresses out for you.
Sorry to sound like a bag, but that's the truth of the matter. Put you mind to it and you'll be fine.