Find the last element in a div

Find the last element in a div


Hello,
I am new to JQuery. This is my first post. I have a div, with a number of
nested divs. I want to append a new div after the last div. For example:
<div id="container">
<div class="row">Some thing here</div    >
<div class="row">Some thing here</div>
<div class="row">Some thing here</div>
</div>
And I want to append a div after the last <div class="row">, so my string to
append is '<div class="row">New Row</div>'. How to find the last element and
append to it?
I don't know if I am missing something fundamental. If I call:
Mychildren = $("#container").children();
How can I then iterate over the result to do 'stuff' and/or find the last
element?
Thanks for the help
Brook