Girls, Will I become entirely flat-chested after loosing a lot of weight?

ILOVEducks12
So, I'm about 34 pounds (c. 16 kilos) overweight at the moment and I'm working on loosing all that by the end of the year. I know health is the most important thing, but I can't help being a bit afraid of my cup size decreasing. :( I'm currently a full C, which I'd be very content with if I were at a healthy a weight.

I know they will inevitably get smaller, but the extent of that is what I'm concerned about. Three years ago, when I was at the weight I'm aiming to reach again, my cup size was already C, except not as full as they currently are. Note that I was 17 and they were still growing, for quite a few years I was a B, but they did reach C at that relatively normal weight (it is still a few pounds above my ideal BMI, but it'd be perfectly fine for me).

Sooo, considering the latter paragraph, is it possible that when I get to that weight again, my boobs will only "shrink" to that not-so-full C cup size?

Also, anyone who did lose a similar amount of weight and managed to stay bustier: do you have any workout tips and such to keep them from drastically shrinking?
Updates
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I just realized that I consistently wrote "loose" instead of "lose". LOL. There goes my English language proficiency certificate out of the window. Shame on me, but it shows how tired I am at the moment. :D
Girls, Will I become entirely flat-chested after loosing a lot of weight?
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