The same people who put the blurbs on the backs of books and approve book covers.

Let us all join together and raise our voices in song...

[to the tune: She'll Be Comin' Round the Mountain]

There's a bimbo on the cover of my book.
There's a bimbo on the cover of my book.
she is blonde and she is sexy
she is nowhere in the text she is
the bimbo on the cover of my book!

there are more verses. ;-)