check if profile exists

Hi peeps,
I have a question about my app.i have 2 models User,Profile with the
regular actions (add,view...etc).When user logs in I enable some
buttons for view,edit,create profile.I want when a User creates a
profile to disable the create button to prevent from creating a new
one or just print a message to tell him that profile exists.
I do something like this inside add function but it doesn't work:

if( $this->Auth->user('id') == $this->data['Profile']['user_id'] ){
//print a warning message
} else {
//proceed to creation
}
Can any1 help me how i can check whether the profile's data are filled
with values and prevent User?

Many Thanks in advance
Paulos
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