title: Already Registered at /appname/: The model User is already registered
body: <p>I'm trying to connect the django.contrib.auth User with my own UserProfile, and I'm getting an 'AlreadyRegistered' error when I go on the site.</p>
  
  <p>Here's the traceback:</p>
  
  <pre><code>Environment:
  
  
  Request Method: GET
  Request URL: myurl.com/django/appname/
  
  Django Version: 1.4.2
  Python Version: 2.6.8
  Installed Applications:
  ('django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.sites',
   'django.contrib.messages',
   'django.contrib.staticfiles',
   'django.contrib.admin',
   'polls',
   'appname',
   'registration',
   'django.contrib.humanize')
  Installed Middleware:
  ('django.middleware.common.CommonMiddleware',
   'django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware')
  
  
  Traceback:
  File "/usr/lib/python2.6/site-packages/django/core/handlers/base.py" in get_response
    101.                             request.path_info)
  File "/usr/lib/python2.6/site-packages/django/core/urlresolvers.py" in resolve
    298.             for pattern in self.url_patterns:
  File "/usr/lib/python2.6/site-packages/django/core/urlresolvers.py" in url_patterns
    328.         patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/usr/lib/python2.6/site-packages/django/core/urlresolvers.py" in urlconf_module
    323.             self._urlconf_module = import_module(self.urlconf_name)
  File "/usr/lib/python2.6/site-packages/django/utils/importlib.py" in import_module
    35.     __import__(name)
  File "/var/www/mysite/mysite/urls.py" in &lt;module&gt;
    3. admin.autodiscover()
  File "/usr/lib/python2.6/site-packages/django/contrib/admin/__init__.py" in autodiscover
    29.             import_module('%s.admin' % app)
  File "/usr/lib/python2.6/site-packages/django/utils/importlib.py" in import_module
    35.     __import__(name)
  File "/var/www/mysite/appname/admin.py" in &lt;module&gt;
    4. admin.site.register(User)
  File "/usr/lib/python2.6/site-packages/django/contrib/admin/sites.py" in register
    80.                 raise AlreadyRegistered('The model %s is already registered' % model.__name__)
  
  Exception Type: AlreadyRegistered at /appname/
  Exception Value: The model User is already registered
  </code></pre>
  
  <p>I'm pretty sure this stems from my app's models.py, seeing as that's all I changed in a major way, I believe.</p>
  
  <pre><code>from django.db import models
  from django.contrib.auth.models import User
  from django.db.models.signals import post_save
  
  class Tag(models.Model):
          pics = models.ManyToManyField('Picture', blank=True)
          name = models.CharField(max_length=30)
  
          def __unicode__(self):
                  return self.name
  
  class UserProfile(models.Model):
          name = models.CharField(max_length=20)
          date_joined = models.DateTimeField('date joined')
          auth_user = models.OneToOneField(User)
  
          def __unicode__(self):
                  return self.name
  
  def create_user_profile(sender, instance, created, **kwargs):
          if created:
                  UserProfile.objects.create(user=instance)
  
  post_save.connect(create_user_profile, sender=User)
  
  class Picture(models.Model):
          name = models.CharField(max_length=100)
          pub_date = models.DateTimeField('date published')
          tags = models.ManyToManyField('Tag', blank=True)
          owner = models.ForeignKey('UserProfile')
          content = models.ImageField(upload_to='instaton')
  
          def __unicode__(self):
                  return self.name
  
  class Comment(models.Model):
          content = models.CharField(max_length=500)
          date = models.DateTimeField('date commented')
          commenter = models.ForeignKey('UserProfile')
          pic = models.ForeignKey('Picture')
  
          def __unicode__(self):
                  return self.content
  </code></pre>