Index: customize-controls.js
===================================================================
--- customize-controls.js	(revision 21626)
+++ customize-controls.js	(working copy)
@@ -111,7 +111,7 @@
 			var control = this,
 				rhex, spot, input, text, update;
 
-			rhex   = /^#([A-Fa-f0-9]{3}){0,2}$/;
+			rhex   = /^(#([A-Fa-f0-9]{3}){1,2})?$/;
 			spot   = this.container.find('.dropdown-content');
 			input  = new api.Element( this.container.find('.color-picker-hex') );
 			update = function( color ) {
@@ -960,4 +960,4 @@
 		api.trigger( 'ready' );
 	});
 
-})( wp, jQuery );
\ No newline at end of file
+})( wp, jQuery );