How to create a UserProfile form in Django with first_name, last_name modifications?
I take it normal that you don't find any information in the docs as you merge two models into a single form. 
Alternatively and maybe very obviously you can: Create two modelforms, one for the user and the other for the userprofile. Set the userprofile modelform to display only firstname and lastname. Put both forms in the same template within a single <form> tag. When it is submitted, call the save methods of each form.
If think my question is pretty obvious and almost every developer working with UserProfile should be able to answer it.
However, I could not find any help on the django documentation or in the Django Book.
When you want to do a UserProfile form in with Django Forms, you'd like to modify the profile fields as well as some User field.
But there is no forms.UserProfileForm (yet?)!
How do you do that?