diff --git a/wp-includes/widgets.php b/wp-includes/widgets.php
index 67f09c4371..b97862b54d 100644
--- a/wp-includes/widgets.php
+++ b/wp-includes/widgets.php
@@ -558,7 +558,9 @@ function register_sidebar($args = array()) {
 	$wp_registered_sidebars[$sidebar['id']] = $sidebar;
 
 	add_theme_support('widgets');
-
+	
+	do_action( 'register_sidebar', $sidebar );
+	
 	return $sidebar['id'];
 }
 
@@ -629,8 +631,10 @@ function wp_register_sidebar_widget($id, $name, $output_callback, $options = arr
 	);
 	$widget = array_merge($widget, $options);
 
-	if ( is_callable($output_callback) && ( !isset($wp_registered_widgets[$id]) || did_action( 'widgets_init' ) ) )
+	if ( is_callable($output_callback) && ( !isset($wp_registered_widgets[$id]) || did_action( 'widgets_init' ) ) ) {
+		do_action( 'wp_register_sidebar_widget', $widget );
 		$wp_registered_widgets[$id] = $widget;
+	}
 }
 
 /**
@@ -685,6 +689,8 @@ function wp_sidebar_description( $id ) {
  * @param int|string $id Widget ID.
  */
 function wp_unregister_sidebar_widget($id) {
+	do_action( 'wp_unregister_sidebar_widget', $id );
+	
 	wp_register_sidebar_widget($id, '', '');
 	wp_unregister_widget_control($id);
 }
@@ -878,6 +884,8 @@ function dynamic_sidebar($index = 1) {
 		$params = apply_filters( 'dynamic_sidebar_params', $params );
 
 		$callback = $wp_registered_widgets[$id]['callback'];
+		
+		do_action( 'dynamic_sidebar', $wp_registered_widgets[$id] );
 
 		if ( is_callable($callback) ) {
 			call_user_func_array($callback, $params);
@@ -1193,6 +1201,8 @@ function the_widget($widget, $instance = array(), $args = array()) {
 	$args = wp_parse_args($args, $default_args);
 	$instance = wp_parse_args($instance);
 
+	do_action( 'the_widget', $widget, $instance, $args );
+
 	$widget_obj->_set(-1);
 	$widget_obj->widget($args, $instance);
 }