case 'user_register':
      $node = new StdClass();
      $node->type = 'content_profile';
      $address_form = content_form($node, $node);
      foreach ($address_form as $key => $value) {
        if (in_array($key, array('field_anrede', 'field_titel', 'field_vorname', 'field_nachname'))) {
          $form['address'][$key] = $value;
        }
      }