Weight loss without losing boobage

how can I lose weight without losing my boobs??I'm in pretty good shape, and im not very overweight, maybe about 15lbs overweight. I love my boob size and dont want to see them shrink along with my thighs. should I cut down on food (I'm a vegetarian) or...

excercise to build muscle? which will impact my size less?

you cant
when you loose weight you loose it all over your body
and the fatty areas are the first to shrink
not eatng enough wont make them stay the way they are
if anything it will make them smaller because youll make yourself unhealthy

It's in your genes. If losing weight causes your (Fatty) boobs to decrease, well, you can't tell your body where to take the fat off. But taking the fat off is good, regardless.
Having good boobage is good, but being healthy is better. Do some weight lifting, for the pecs, if your boobs lose some weight, having your pecs in good shape will still make them awesome. Trust me, guys like girls with pecs.