Getting last class from a other class

I want get last class in .fine_class, but my code give me undefined. how can fix it?

Example: http://jsfiddle.net/gBxan/

<div class="find_class">
    <div class="class1"></div>
    <div class="class2"></div>
    <div class="class3"></div> <!-- I wan get class this div -->
</div>

var find = $  ('div.find_class div:last').find('div:last').attr('class');
alert(find);

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