diff --git a/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php b/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php
index 6a8f7cd..8459c52 100644
--- a/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php
+++ b/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\Core\Entity\Plugin\Validation\Constraint;
 
+use Drupal\Core\Entity\ContentEntityInterface;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
 
@@ -33,5 +34,13 @@ public function validate($value, Constraint $constraint) {
       $type = $value->getFieldDefinition()->getSetting('target_type');
       $this->context->addViolation($constraint->message, array('%type' => $type, '%id' => $id));
     }
+    elseif ($referenced_entity->isNew() && $referenced_entity instanceof ContentEntityInterface) {
+      $violations = $referenced_entity->validate();
+      /** @var \Symfony\Component\Validator\ConstraintViolationInterface $violation */
+      foreach ($violations as $violation) {
+        $this->context->addViolation($violation->getMessageTemplate(), $violation->getMessageParameters());
+      }
+    }
   }
+
 }
diff --git a/core/modules/field/src/Tests/EntityReference/EntityReferenceItemTest.php b/core/modules/field/src/Tests/EntityReference/EntityReferenceItemTest.php
index c1179f0..36f1e10 100644
--- a/core/modules/field/src/Tests/EntityReference/EntityReferenceItemTest.php
+++ b/core/modules/field/src/Tests/EntityReference/EntityReferenceItemTest.php
@@ -214,4 +214,40 @@ public function testEntitySaveOrder() {
     $this->assertEqual($entity->field_test_taxonomy_term->entity->id(), $term->id());
   }
 
+  /**
+   * Tests if an auto-created reference entity is validated when validating the
+   * host.
+   */
+  public function testValidateAutoCreatedEntityReference() {
+    $checks = array(
+      'The username cannot begin with a space.',
+      'The username cannot end with a space.',
+      'The username cannot contain multiple spaces in a row.',
+      'The username %name is too long: it must be %max characters or less.',
+    );
+
+    entity_reference_create_field('entity_test', 'entity_test', 'field_test_author', 'Test user entity reference', 'user');
+
+    $account = entity_create('user', array(
+      // We create an user account with a wrong username.
+      'name' => ' wrong  username01234567890123456789012345678901234567890123456789 ',
+      'mail' => $this->randomMachineName() . '@example.com',
+    ));
+
+    // Create the host entity and attach the term.
+    $entity = entity_create('entity_test');
+    $entity->name->value = $this->randomMachineName();
+    $entity->field_test_author->entity = $account;
+
+    // Validate the host entity.
+    $violations = $entity->validate();
+
+    $this->assertEqual(count($violations), 4);
+
+    /** @var \Symfony\Component\Validator\ConstraintViolationInterface $violation */
+    foreach ($violations as $delta => $violation) {
+      $this->assertEqual($violation->getMessageTemplate(), $checks[$delta]);
+    }
+  }
+
 }