Oh god, Katy Perry.
Call me a prude, but I thought she was supposed to be a recording artist.  In fact her "career" seems to consist of being photographed as often as humanly possible, displaying her baps in a disparate variety of outfits seemingly borrowed from a much smaller person.
...and the problem is?
As I said, call me a prude..... 
I'm afraid I have a bit of a puritanical streak, probably the result of a religious upbringing (even though I'm now very much an unbeliever).
I find it hard to admire someone who's supposed to be an "actress" or "singer" but is actually nothing more than a professional celebrity, self-publicising in the cheapest way possible.  Same applies to Kelly Brook.  They're really no different from Jordan, Jodie Marsh or some random slapper from Series 5 of Big Brother.  I wish our lowest-common-denominator society would stop rewarding such people.
Sorry, taking it all too seriously, I know...
[/rant]