How to move an element to end of it's parent?

How to move an element to end of it's parent?

I have the following

  1. <div id="container">
  2.   <div class="row">blah</div>
  3.   <div class="row">blah</div>
  4.   <div class="row">blah</div>
  5.   <div class="row">blah</div>
  6.   <div class="row">blah</div>
  7. </div>
I would like to move the upper most row which I'm referencing by the eq:

  1. $('.row').eq(0)
to the end of div#container

I thought I could use append or appendTo, but these don't seem to be working.

Any ideas welcome! Thanks :)