I imagine at some point you've asked yourself the question "what is Katy Perry's bra size" like many other admirers of hers. And believe it or not Katy Perry actually mention her bra size in an interview, when she said she was a 32D.
Naturally this sparked a bit of controversy and some people cried fowl, claiming there was no way the singer could possibly have a D cup bra size.
I for one think she does in fact wear a D, perhaps she doesn't fill it completely, but she is clearly too big for a C cup bra.
Plus i found a sit that lists tons of bra sizes and they also listed Katy Perry with a 32D. So take that doubters!