diff --git a/lib/devise/controllers/helpers.rb b/lib/devise/controllers/helpers.rb
index 7f887120..834226e5 100644
--- a/lib/devise/controllers/helpers.rb
+++ b/lib/devise/controllers/helpers.rb
@@ -72,16 +72,18 @@ module Devise
         false
       end
 
-      # Check if the given scope is signed in session, without running
-      # authentication hooks.
-      def signed_in?(scope)
-        warden.authenticate?(:scope => scope)
+      # Return true if the given scope is signed in session. If no scope given, return
+      # true if any scope is signed in. Does not run authentication hooks.
+      def signed_in?(scope=nil)
+        [ scope || Devise.mappings.keys ].flatten.any? do |scope| 
+          warden.authenticate?(:scope => scope)
+        end
       end
 
-      # Check if the any scope is signed in session, without running
-      # authentication hooks.
       def anybody_signed_in?
-        Devise.mappings.keys.any? { |scope| signed_in?(scope) }
+        ActiveSupport::Deprecation.warn "Devise#anybody_signed_in? is deprecated. "
+          "Please use Devise#signed_in?(nil) instead."
+        signed_in?
       end
 
       # Sign in an user that already was authenticated. This helper is useful for logging
diff --git a/test/controllers/helpers_test.rb b/test/controllers/helpers_test.rb
index d77a5c20..83578a6a 100644
--- a/test/controllers/helpers_test.rb
+++ b/test/controllers/helpers_test.rb
@@ -13,16 +13,16 @@ class ControllerAuthenticableTest < ActionController::TestCase
     assert_equal @mock_warden, @controller.warden
   end
 
-  test 'proxy signed_in? to authenticated' do
+  test 'proxy signed_in?(scope) to authenticate?' do
     @mock_warden.expects(:authenticate?).with(:scope => :my_scope)
     @controller.signed_in?(:my_scope)
   end
-
-  test 'proxy anybody_signed_in? to signed_in?' do
+  
+  test 'proxy signed_in?(nil) to authenticate?' do
     Devise.mappings.keys.each do |scope| # :user, :admin, :manager
-      @controller.expects(:signed_in?).with(scope)
+      @mock_warden.expects(:authenticate?).with(:scope => scope)
     end
-    @controller.anybody_signed_in?
+    @controller.signed_in?
   end
 
   test 'proxy current_user to authenticate with user scope' do