Flat abs for wedding

I'm going to be in a Wedding, and if I have a tight dress, I don't want fat sticking out for everyone to see. I already lost enough weight, but I need nice flat abs. Anyone know of any nice exercises to flatten my Abs over- time?
Thanks

Lots of situps. If you can do 30 without having to stop, hold something against your chest that has a comfortable amount of weight to it. That will make your abs work harder. If you do them everyday, you should see some results in a month or so

Do stomach crunches. sit-ups will not get you where you want to be. Really emphasise the proper form when doing them so you're not cheating yourself.
-bring your chest towards the ceiling
-hands gently behind your head for added resistance
-remember these are not sit-ups, you are not bringing your head to your knees

I do crunches/situps two different ways: For upper abs, I only lift my body a few inches off the ground, then down. For lower abs, start about halfway up, and go almost all the way to knees. Its worked good for me. I hold a 5kg medicine ball on my chest.