Django extending user with userprofile (error: User has no profile.)

someone can told me, why this code don't working? I'm trying to create a registration form for users.

I'm getting an error

"RelatedObjectDoesNotExist at /signup/client/2/ User has no profile."

views.py

if request.POST:
            user_form = UserCreationForm(request.POST)
            profile_form = ProfileForm(request.POST)
            if user_form.is_valid() and profile_form.is_valid():
                user = user_form.save()
                user.profile.city="WW"
                user.profile.phone="32323"
                user.profile.save()

forms.py

class UserForm(forms.ModelForm):
    class Meta:
        model = User
        fields = ('first_name', 'last_name', 'email')

class ProfileForm(forms.ModelForm):
    class Meta:
        model = Profile
        fields = ( 'city', 'phone')

html file

  <h2>Sign up</h2>
  <form method="post">
    {% csrf_token %}
    {{ user_form.as_p }}
    {{ profile_form.as_p }}
    <button type="submit">Sign up</button>

models.py

from __future__ import unicode_literals
from django.contrib.auth.models import User
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    city = models.TextField(max_length = 50)
    phone = models.TextField(max_length = 12)

You need to create a profile, it does not get created when you save user_form

        user_form = UserCreationForm(request.POST)
        profile_form = ProfileForm(request.POST)
        if user_form.is_valid() and profile_form.is_valid():
            user = user_form.save()
            Profile.objects.create(**{
                 'city':"WW", 'phone': '32323', 'user': user
            })
            # ^^^^^^