Collection::addAttributeToSelect() undefined method in Magento

Fatal error: Call to undefined method Desbest_Showdown_Model_Mysql4_Votes_Collection::addAttributeToSelect() in /home/desbest/public_html/clients/magentofull/app/code/local/Desbest/Showdown/controllers/IndexController.php on line 19

IndexController.php

public function voteAction(){
    $shake = Mage::getModel('showdown/votes')
        ->getCollection()
        ->addAttributeToSelect('*')
        ;
}

===============

code/local/Desbest/Showdown/Model/Mysql4/Votes/Collection.php

<?php
class Desbest_Showdown_Model_Mysql4_Votes_Collection extends Mage_Core_Model_Mysql4_Collection_Abstract
{
    public function _construct()
    {
        parent::_construct();
        $this->_init('showdown/votes');
    }
}