There is no "Secret"
Ask any othe successful Brides to Be on this site how they lost their weight.
Hard work and determination. Forget about all the fancy BS diets.
Eat right, and workout! The American College of Sports Medicine has come out saying that for real significant weight loss, you need to be exercising at a moderate intensity for 200-300 minutes per week. Which means 4-5 hours, So 1 hour workouts, 4-5 days per week.
If you workout very intensely, you can cut that number down. But thats what we are looking at for weight loss.
As for diet, most studies show a high protein diet more effective in SHORT term weight loss, less than 2 months, at 12 months though, a high protein diet was not more effective than any other diet.
It comes down to calories in the long run. BUT those who drastically reduced their caloric intake lost LESS than those who redueced their daily caloric intake by 70%.
So if you have a wedding in less then 2 months, high protein diet.
If its months away. Just watch your calories, and yes, you can even have some bread! I know it seems like blasphemy, you'll be fine.
Good luck, and remember, if its important to you, MAKE it important in your daily life.