diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 2a447b7cff1..d0941a44a4e 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -1044,11 +1044,10 @@ class ModelAdmin(BaseModelAdmin):
         Determine the HttpResponse for the add_view stage.
         """
         opts = obj._meta
-        pk_value = obj._get_pk_val()
         preserved_filters = self.get_preserved_filters(request)
         obj_url = reverse(
             'admin:%s_%s_change' % (opts.app_label, opts.model_name),
-            args=(quote(pk_value),),
+            args=(quote(obj.pk),),
             current_app=self.admin_site.name,
         )
         # Add a link to the object's change form if the user can edit the obj.
@@ -1145,7 +1144,6 @@ class ModelAdmin(BaseModelAdmin):
             })
 
         opts = self.model._meta
-        pk_value = obj._get_pk_val()
         preserved_filters = self.get_preserved_filters(request)
 
         msg_dict = {
@@ -1170,7 +1168,7 @@ class ModelAdmin(BaseModelAdmin):
             self.message_user(request, msg, messages.SUCCESS)
             redirect_url = reverse('admin:%s_%s_change' %
                                    (opts.app_label, opts.model_name),
-                                   args=(pk_value,),
+                                   args=(obj.pk,),
                                    current_app=self.admin_site.name)
             redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
             return HttpResponseRedirect(redirect_url)
diff --git a/django/contrib/admin/utils.py b/django/contrib/admin/utils.py
index 05fbcebcb9b..5f3a83267dc 100644
--- a/django/contrib/admin/utils.py
+++ b/django/contrib/admin/utils.py
@@ -145,7 +145,7 @@ def get_deleted_objects(objs, opts, user, admin_site, using):
                                     % (admin_site.name,
                                        opts.app_label,
                                        opts.model_name),
-                                    None, (quote(obj._get_pk_val()),))
+                                    None, (quote(obj.pk),))
             except NoReverseMatch:
                 # Change url doesn't exist -- don't display link to edit
                 return no_edit_link
diff --git a/django/contrib/contenttypes/fields.py b/django/contrib/contenttypes/fields.py
index e4e759502c2..9394182aeee 100644
--- a/django/contrib/contenttypes/fields.py
+++ b/django/contrib/contenttypes/fields.py
@@ -203,7 +203,7 @@ class GenericForeignKey:
                         model)
 
         return (ret_val,
-                lambda obj: (obj._get_pk_val(), obj.__class__),
+                lambda obj: (obj.pk, obj.__class__),
                 gfk_key,
                 True,
                 self.name)
@@ -229,7 +229,7 @@ class GenericForeignKey:
             rel_obj = None
         else:
             if rel_obj and (ct_id != self.get_content_type(obj=rel_obj, using=instance._state.db).id or
-                            rel_obj._meta.pk.to_python(pk_val) != rel_obj._get_pk_val()):
+                            rel_obj._meta.pk.to_python(pk_val) != rel_obj.pk):
                 rel_obj = None
 
         if rel_obj is not None:
@@ -249,7 +249,7 @@ class GenericForeignKey:
         fk = None
         if value is not None:
             ct = self.get_content_type(obj=value)
-            fk = value._get_pk_val()
+            fk = value.pk
 
         setattr(instance, self.ct_field, ct)
         setattr(instance, self.fk_field, fk)
@@ -397,7 +397,7 @@ class GenericRelation(ForeignObject):
 
     def value_to_string(self, obj):
         qs = getattr(obj, self.name).all()
-        return str([instance._get_pk_val() for instance in qs])
+        return str([instance.pk for instance in qs])
 
     def contribute_to_class(self, cls, name, **kwargs):
         kwargs['private_only'] = True
@@ -490,7 +490,7 @@ def create_generic_related_manager(superclass, rel):
             self.content_type_field_name = rel.field.content_type_field_name
             self.object_id_field_name = rel.field.object_id_field_name
             self.prefetch_cache_name = rel.field.attname
-            self.pk_val = instance._get_pk_val()
+            self.pk_val = instance.pk
 
             self.core_filters = {
                 '%s__pk' % self.content_type_field_name: content_type.id,
@@ -529,7 +529,7 @@ def create_generic_related_manager(superclass, rel):
 
             query = {
                 '%s__pk' % self.content_type_field_name: self.content_type.id,
-                '%s__in' % self.object_id_field_name: {obj._get_pk_val() for obj in instances}
+                '%s__in' % self.object_id_field_name: {obj.pk for obj in instances}
             }
 
             # We (possibly) need to convert object IDs to the type of the
@@ -537,7 +537,7 @@ def create_generic_related_manager(superclass, rel):
             object_id_converter = instances[0]._meta.pk.to_python
             return (queryset.filter(**query),
                     lambda relobj: object_id_converter(getattr(relobj, self.object_id_field_name)),
-                    lambda obj: obj._get_pk_val(),
+                    lambda obj: obj.pk,
                     False,
                     self.prefetch_cache_name)
 
diff --git a/django/core/serializers/xml_serializer.py b/django/core/serializers/xml_serializer.py
index 23a07ef43a1..1fb00938508 100644
--- a/django/core/serializers/xml_serializer.py
+++ b/django/core/serializers/xml_serializer.py
@@ -49,7 +49,7 @@ class Serializer(base.Serializer):
         self.indent(1)
         attrs = OrderedDict([("model", str(obj._meta))])
         if not self.use_natural_primary_keys or not hasattr(obj, 'natural_key'):
-            obj_pk = obj._get_pk_val()
+            obj_pk = obj.pk
             if obj_pk is not None:
                 attrs['pk'] = str(obj_pk)
 
@@ -79,7 +79,7 @@ class Serializer(base.Serializer):
                 self.xml.characters(field.value_to_string(obj))
             except UnserializableContentError:
                 raise ValueError("%s.%s (pk:%s) contains unserializable characters" % (
-                    obj.__class__.__name__, field.name, obj._get_pk_val()))
+                    obj.__class__.__name__, field.name, obj.pk))
         else:
             self.xml.addQuickElement("None")
 
@@ -130,7 +130,7 @@ class Serializer(base.Serializer):
             else:
                 def handle_m2m(value):
                     self.xml.addQuickElement("object", attrs={
-                        'pk': str(value._get_pk_val())
+                        'pk': str(value.pk)
                     })
             for relobj in getattr(obj, field.name).iterator():
                 handle_m2m(relobj)
diff --git a/django/db/models/base.py b/django/db/models/base.py
index 16c7d3636f4..4673920ade3 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -511,15 +511,15 @@ class Model(metaclass=ModelBase):
             return False
         if self._meta.concrete_model != other._meta.concrete_model:
             return False
-        my_pk = self._get_pk_val()
+        my_pk = self.pk
         if my_pk is None:
             return self is other
-        return my_pk == other._get_pk_val()
+        return my_pk == other.pk
 
     def __hash__(self):
-        if self._get_pk_val() is None:
+        if self.pk is None:
             raise TypeError("Model instances without primary key value are unhashable")
-        return hash(self._get_pk_val())
+        return hash(self.pk)
 
     def __reduce__(self):
         data = self.__dict__
@@ -867,7 +867,7 @@ class Model(metaclass=ModelBase):
 
     def delete(self, using=None, keep_parents=False):
         using = using or router.db_for_write(self.__class__, instance=self)
-        assert self._get_pk_val() is not None, (
+        assert self.pk is not None, (
             "%s object can't be deleted because its %s attribute is set to None." %
             (self._meta.object_name, self._meta.pk.attname)
         )
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 09f9940b6b5..ac8eb778fa8 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -799,7 +799,7 @@ class Field(RegisterLookupMixin):
                    for x in rel_model._default_manager.complex_filter(
                        limit_choices_to)]
         else:
-            lst = [(x._get_pk_val(), smart_text(x))
+            lst = [(x.pk, smart_text(x))
                    for x in rel_model._default_manager.complex_filter(
                        limit_choices_to)]
         return first_choice + lst
diff --git a/django/db/models/fields/related.py b/django/db/models/fields/related.py
index 684f88e8b6a..f7553550795 100644
--- a/django/db/models/fields/related.py
+++ b/django/db/models/fields/related.py
@@ -1604,7 +1604,7 @@ class ManyToManyField(RelatedField):
             initial = defaults['initial']
             if callable(initial):
                 initial = initial()
-            defaults['initial'] = [i._get_pk_val() for i in initial]
+            defaults['initial'] = [i.pk for i in initial]
         return super().formfield(**defaults)
 
     def db_check(self, connection):
diff --git a/django/db/models/fields/related_descriptors.py b/django/db/models/fields/related_descriptors.py
index 86da637f26f..0d7507f33f7 100644
--- a/django/db/models/fields/related_descriptors.py
+++ b/django/db/models/fields/related_descriptors.py
@@ -319,7 +319,7 @@ class ReverseOneToOneDescriptor:
         rel_obj_attr = attrgetter(self.related.field.attname)
 
         def instance_attr(obj):
-            return obj._get_pk_val()
+            return obj.pk
 
         instances_dict = {instance_attr(inst): inst for inst in instances}
         query = {'%s__in' % self.related.field.name: instances}
@@ -354,7 +354,7 @@ class ReverseOneToOneDescriptor:
         try:
             rel_obj = getattr(instance, self.cache_name)
         except AttributeError:
-            related_pk = instance._get_pk_val()
+            related_pk = instance.pk
             if related_pk is None:
                 rel_obj = None
             else:
diff --git a/django/db/models/fields/reverse_related.py b/django/db/models/fields/reverse_related.py
index 36396ac2822..ab8b3ffe588 100644
--- a/django/db/models/fields/reverse_related.py
+++ b/django/db/models/fields/reverse_related.py
@@ -122,7 +122,7 @@ class ForeignObjectRel:
         initially for utilization by RelatedFieldListFilter.
         """
         return (blank_choice if include_blank else []) + [
-            (x._get_pk_val(), str(x)) for x in self.related_model._default_manager.all()
+            (x.pk, str(x)) for x in self.related_model._default_manager.all()
         ]
 
     def is_hidden(self):
diff --git a/django/db/models/query.py b/django/db/models/query.py
index bc9ee1c5f8d..8e2aa0a1414 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -583,7 +583,7 @@ class QuerySet:
                 qs = self.filter(pk__in=id_list).order_by()
         else:
             qs = self._clone()
-        return {obj._get_pk_val(): obj for obj in qs}
+        return {obj.pk: obj for obj in qs}
 
     def delete(self):
         """Delete the records in the current QuerySet."""