Wordpress query to show only sticky posts


Staff member
Following is my wordpress query in which i want to show only sticky posts but the query is not showing any posts. Also I set two posts as sticky so that part is checked!!!. Kindly let me know how to modify this query so it will only show the posts which are sticky

   $wp_query = null; 
  $wp_query =  new WP_Query(array(
 'posts_per_page' => 2,
 //'paged' => get_query_var('paged'),
 'post_type' => 'post',
'post__in'  =>  'sticky_posts',
 //'post__not_in' => array($lastpost),
 'post_status' => 'publish',
 'caller_get_posts'=> 0 ));

  while ($wp_query->have_posts()) : $wp_query->the_post(); $lastpost[] = get_the_ID();