I'm pretty sure she meant it as a joke. Let's all present a good, collective sense of humor and let it go? I fear that we may creep her out.
Agreeing with Robin_K and the rest who aligned...
One additional thought is: She is likely aware that many of us like breast enlargement at all costs, any way possible, always more... So in addition to making a joke in good humor, it's pretty likely she was tossing us an idea, a possibility, that we would find desirable and exciting. (I appreciate the idea that she'd be willing to be playful with us - that's confident, kind, engaging, all indicative of a very appealing personality behind the images we see.)
In the light of that, our reaction - so many saying "Nooooo!" - might have been quite puzzling.

Especially since her images have been morph candidates for so long.
IMHO, I enjoy seeing her looking so good and knowing that is all natural - one of those things that give me hope for the human race.
-D'Artagnian
[Someone with expertise here might want to politely suggest various nonsurgical enhancement methods - herbals/phytoestrogens, fenogreek, yadda...]