Performance impact of using decorators

[vinjvinj]

I'm building an application with cherrypy and have started using
decorators quite extensively. A lot of my exposed functions look like:

@expose
@startTransactrionAndBuildPage
@partOfTabUi(tabId)
@convert(arg1=int, arg2=str)
def do_main_page(self, arg1, arg2):
   some code


I've become really fond of decorators and use them quite a lot. I've
also ready that function calls are expensive in python. In the above
example, does the interpreter call 5 different functions?