Need tricks to hide my belly in my prom dress?

This is my Senior Prom and I dont have much of a belly but it is that type of dress that shows everything off. I have a little muffin top and it really shows, I just would like to look smooth. I have heard things like Saran wrap but I havent tried it it. Another thing I dont have the chest to fill out my dress all the way and I was hoping not to alter it, any ideas there?