Index: wp-includes/post-template.php
===================================================================
--- wp-includes/post-template.php	(revision 20755)
+++ wp-includes/post-template.php	(working copy)
@@ -692,7 +692,7 @@
  * @return string Link.
  */
 function _wp_link_page( $i ) {
-	global $post, $wp_rewrite;
+	global $post, $wp_rewrite, $preview;
 
 	if ( 1 == $i ) {
 		$url = get_permalink();
@@ -703,6 +703,13 @@
 			$url = trailingslashit(get_permalink()) . user_trailingslashit("$wp_rewrite->pagination_base/" . $i, 'single_paged');
 		else
 			$url = trailingslashit(get_permalink()) . user_trailingslashit($i, 'single_paged');
+
+		if ( $preview ) {
+			$url = add_query_arg( array( 'preview' => 'true' ), $url );
+			
+			if ( 'draft' !== $post->post_status )
+				$url = add_query_arg( array( 'preview_id' => $post->ID, 'preview_nonce' => wp_create_nonce( 'post_preview_' . $post->ID ) ), $url );
+		}
 	}
 
 	return '<a href="' . esc_url( $url ) . '">';