diff --git a/lib/validations.js b/lib/validations.js
index 086349c11..ee037595a 100644
--- a/lib/validations.js
+++ b/lib/validations.js
@@ -411,8 +411,33 @@ Validatable.prototype.isValid = function (callback, data) {
   var valid = true, inst = this, wait = 0, async = false;
   var validations = this.constructor.validations;
 
+  var nestedModelsToValidate = Object.keys(inst.constructor.definition.properties)
+    .filter(function (attr) { return inst[attr] !== null && typeof(inst[attr]) === 'object' ; })
+    .map(function (attr) {
+      var result = [];
+      var nestedInst = inst[attr];
+      if (Array.isArray(nestedInst) && nestedInst.itemType.prototype.isValid === Validatable.prototype.isValid) {
+        for (var i = 0; i < nestedInst.length; i++) {
+          result.push({
+            attr: attr + "." + i,
+            inst: nestedInst[i]
+          });
+        }
+      } else if (nestedInst.isValid === Validatable.prototype.isValid) {
+        result.push({
+          attr: attr,
+          inst: nestedInst
+        });
+      }
+      return result;
+    })
+    .reduce(function (result, models) {
+      Array.prototype.push.apply(result, models);
+      return result;
+    }, []);
+
   // exit with success when no errors
-  if (typeof validations !== 'object') {
+  if (typeof validations !== 'object' && !nestedModelsToValidate.length) {
     cleanErrors(this);
     if (callback) {
       this.trigger('validate', function (validationsDone) {
@@ -453,6 +478,25 @@ Validatable.prototype.isValid = function (callback, data) {
       });
     });
 
+    nestedModelsToValidate.forEach(function (model) {
+      var nestedCallback = function () {};
+      var nestedValid = model.inst.isValid(function (valid) {
+        nestedCallback(!valid);
+      });
+      if (nestedValid === undefined) {
+        async = true;
+        wait += 1;
+        nestedCallback = function (fail) {
+          if (fail)
+            inst.errors.addNested(model.attr, model.inst.errors);
+          done(fail);
+        };
+      } else if (!nestedValid) {
+        inst.errors.addNested(model.attr, model.inst.errors);
+        valid = false;
+      }
+    });
+
     if (!async) {
       validationsDone.call(inst, function () {
         if (valid) cleanErrors(inst);
@@ -666,6 +710,20 @@ Errors.prototype.add = function (field, message, code) {
   this.codes[field].push(code);
 };
 
+Errors.prototype.addNested = function (parentField, nestedErrors) {
+  var self = this;
+  var fields = Object.keys(nestedErrors);
+  fields.forEach(function (field) {
+    var errorsCount = nestedErrors[field].length;
+    for (var i = 0; i < errorsCount; i++) {
+      var parentAttr = parentField + "." + field;
+      var message = nestedErrors[field][i];
+      var code = nestedErrors.codes[field][i];
+      self.add(parentAttr, message, code);
+    }
+  });
+}
+
 function ErrorCodes(messages) {
   var c = this;
   Object.keys(messages).forEach(function (field) {
diff --git a/test/validations.test.js b/test/validations.test.js
index 9df68d465..d967a92cf 100644
--- a/test/validations.test.js
+++ b/test/validations.test.js
@@ -535,4 +535,82 @@ describe('validations', function () {
       return err.message.replace(/^.*Details: /, '');
     }
   });
+
+  describe('nested models', function() {
+    var Parent;
+    describe('nested property', function() {
+      before(function (done) {
+        Parent = db.define('Parent', {
+          user: User
+        });
+        done();
+      });
+
+      it('should skip undefined values', function(done) {
+        var parent = new Parent();
+        parent.isValid().should.be.true;
+        done();
+      });
+      it('should skip null values', function(done) {
+        var parent = new Parent({user: null});
+        parent.isValid().should.be.true;
+        done();
+      });
+      it('validate property value', function(done) {
+        User.validatesPresenceOf('name');
+        var parent = new Parent({user: {}});
+        parent.isValid().should.not.be.true;
+        parent.errors['user.name'].should.eql(['can\'t be blank']);
+        parent.user.name = 1;
+        parent.isValid().should.true;
+        done();
+      });
+      it('property value has async validations', function (done) {
+        function customValidator(err, done) {
+          var self = this;
+          process.nextTick(function () {
+            if (self.name === 'bad') err();
+            done();
+          });
+        };
+        User.validateAsync('name', customValidator, {message: 'Bad name'});
+        var parent = new Parent({user: {name: 'bad'}});
+        should(parent.isValid(function(valid) {
+          valid.should.not.be.true;
+          parent.user.name = 1;
+          should(parent.isValid(function(valid) {
+            valid.should.be.true;
+            done();
+          })).be.undefined;
+        })).be.undefined;
+      });
+    });
+    describe('nested array', function() {
+      before(function (done) {
+        Parent = db.define('Parent', {
+          users: [User]
+        });
+        done();
+      });
+
+      it('should work for null values', function(done) {
+        var parent = new Parent({users: []});
+        parent.users.push(null);
+        parent.isValid().should.be.true;
+        done();
+      });
+
+      it('validate value', function(done) {
+        User.validatesPresenceOf('name');
+        var parent = new Parent({users: []});
+        parent.users.push({});
+        parent.isValid().should.not.be.true;
+        parent.errors['users.0.name'].should.eql(['can\'t be blank']);
+        parent.users[0].name = 1;
+        parent.isValid().should.be.true;
+        done();
+      });
+
+    });
+  });
 });