Hide specific form label

I have a form used on several pages but on one specific page I want to hide a couple of the non-required fields.
I have something like this:
<label for="field_6">My Label Text: </label>
<input id="field_6" type="text" value="" name="field_6">
I to hide the input field I use
#field_6 {display: none
How would I hide the label for field_6 and keep all other fields visible?
The form is automatically generated by a plugin in wordpress so I can't easily add anything to the html.
thanks!!

See original post by bellcom