When I saw the headline of this I thought, Did they mean 'Katy's DVDs'? Haha.
About those DDs I haven't got a clue really; I only wanted to say, that Ms Katy Perry could have had any kind of breast enlargement I find most unlikely. When you look at her moving body you wouldn't suspect that; who knows why people do.
But what I like about her appearance so much is that she's simply got a perfect body shape, and size and shape of her bust are just part of it anyway. (Yes, I do like her big bust, but only because she's so incredibly beautiful all over.)
P.S. But have people ever looked at her hands? I find them so beautiful!