Passing First & Last Name From Logged In User's Site Profile

I'm using forms on private pages for logged in members only. In the form I have a couple of fields that I would like dynamically populated.

NAME: First, Last.

I inserted:

{user:first_name}

into the first name field of "Field Parameter Name"

and I inserted:

{user:last_name}

into the last name field of "Field Parameter Name"

I tested it while logged into admin and the admin first name and admin last name are not being pre-populated. I tried this while inserting the form into a post and then I tried it with the form inserted in a sidebar....neither are working.

Any help would be greatly appreciated. Thanks in advance.

Thank you. Any plans to integrate the ability to merge first and last names via the merge tags using the "Name" field?