[jQuery] Simple Question with Clone() and Append()

[Renato Untalan]

I'm trying to clone an element, more specifically a fieldset tag.

Original HTML:
<fieldset>Hello World.</fieldset>

Javascript:
$("fieldset").each(function(count,item){
  var fieldsetBlock = $(this).append($(this).clone())
})


Desired HTML:
<fieldset>Hello World.</fieldset>
<fieldset>Hello World.</fieldset>

Undesired Result:
<fieldset>
  Hello World.
    <fieldset>
      Hello World.
    </fieldset>
</fieldset>

I hope this is a trivial question.  Thanks in advance jquery friends!
Any help is appreciated.