This is what I use. Slightly different than what you posted:
<?php
$args=array(
‘category’ => ‘CAT’,
‘post_type’ => array( ‘post’, ‘premier’ ),
‘post_status’ => ‘publish’,
‘posts_per_page’ => -1,
‘caller_get_posts’=> 1
);
$my_query = null;
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {
while ($my_query->have_posts()) : $my_query->the_post(); ?>
Where ‘Cat’ = the category Name.