J.F.
Well, I don't recommend it, but I had to lose weight pronto when my bridesmaids dress for my cousins wedding didn't fit a week before the wedding. I lost 9 lbs in 6 days by eating nothing but lettuce with 1 tbs of fat free dressing each time I felt hungry and a tbs of peanut butter twice a day. I drank nothing but water, and I exercised (eliptical) every chance I had throughout the day. I lost the weight and looked great in the dress. About weeks after the wedding (and after I started eating normal again), not only had I gained those 9 lbs back, but I had also gained an extra 12 on top of it. I've never been able to lose those extra pounds (4 years later!). My advice...just get some bigger clothes and deal with the extra weight.