does belly dancing tone your stomach?

[Italiana]

im 20 and i want to start belly dancing.. im a good dancer and i love doing all the exotic sexy dancjng at clubs.. but i wanted to get into classes for belly dancing.. but what shakira does.. not a cheap class.. should i see whats on youtube for beginners?... and will it take off weight from my chest because i dont want to lose my boobs im a DD 34 and i have toned legs. i just want my stomach toned... and with belly dancing i saw that on youtube a few girls mention to hold in your stomach is that rite? u tuck it in.. but how does that tone it if your holding it in.. can somekne give me advice on what and how or even where i shud go.. im in the canada toronto area