Index: wp-content/themes/twentytwelve/content.php
===================================================================
--- wp-content/themes/twentytwelve/content.php	(revision 21261)
+++ wp-content/themes/twentytwelve/content.php	(working copy)
@@ -9,7 +9,7 @@
 ?>
 
 	<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
-		<?php if ( is_sticky() ) : ?>
+		<?php if ( is_sticky() && ! is_single() ) : ?>
 		<div class="featured-post">
 			<?php _e( 'Featured post', 'twentytwelve' ); ?>
 		</div>