#signals.py

def user_created(sender, user, request, **kwargs):
    form = UserForm(request.POST)
    user.first_name = form.data['first_name']
    user.last_name  = form.data['last_name']
    user.save()
    profile = UserProfile(user=user)
    profile.middle_name = form.data['middle_name']
    profile.gender = form.data['gender']
    profile.save()

user_registered.connect(user_created)

#backends.py

class NoActivationBackend(DefaultBackend):
    def register(self, request, **kwargs):
        username, email, password = kwargs['username'], kwargs['email'], kwargs['password1']
        username = email
        u = User.objects.create_user(username, email, password)
        u.save()

        new_user = authenticate(username=username, password=password)

        login(request, new_user)
        signals.user_registered.send(sender=self.__class__,
                                     user=new_user,
                                     request=request)
        return new_user