Need to fit into my wedding dress!

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I had my wedding dress tailored for me 2 years ago......finally going to get married this spring and I don't fit into the dress! I've gone up almost 15 pounds from when I had it fitted. So, I've got 12 weeks to drop those pesky pounds and get my body back into bikini shape. I'm a spinning instructor and do super hard cardio, but have pretty much stopped doing any strength training and my diet has gone to the dogs. So I joined My Fitness Pal to keep myself honest about my diet, and added in a 12 week toning workout routine. It is really a great help to have the calorie totals on here, and easy to add foods and workouts. Good luck to all the other brides to be!