Add class to DIV with TD Wrapping

Im trying to add a class to a TD which contains a DIV.

HTML:

<td>
  <div class="report">
    Some HTML
  </div>
</td>

My jQuery:

$('.report').prev().addClass('wrapper');

What am I doing wrong?

$('.report').parent().addClass('wrapper');

Parent, not Prev :)

.prev() searches only among siblings of the node, ie. nodes that reside on the same level of the DOM tree. The function you're looking for is .parent().