Foreign key dependent model's data not getting saved !

Whats the problem with this code ?

models.py

class userprofile(models.Model):
    user = models.OneToOneField(User)
    Firstname = models.CharField(max_length=20)
    Middlename = models.CharField(max_length=20)
    Surname = models.CharField(max_length=20)
    Gender = models.CharField(max_length=1, blank=False, choices=GENDER_CHOICES)
    Date_of_Birth = models.DateField()
    Hometown = models.ForeignKey(city)
    StudentType = models.CharField(max_length=20, blank=False,  choices=STUDENT_CHOICES)

forms.py
from django.contrib.auth
class RegForm(ModelForm):
    Date_of_Birth = forms.DateField(widget=SelectDateWidget(years=[y for y in range(1960,2005)]))
    class Meta:
        model = userprofile
        exclude = ('user',)


views.py
from django.contrib.auth.forms import UserCreationForm

def register(request):
    if request.method == 'POST':
        form = UserCreationForm(request.POST)
        uprofile = RegForm(request.POST)
        if form.is_valid() and uprofile.is_valid():
            userid = form.save()
            a = RegForm(request.POST,user = userid)
            a.save()
            return direct_to_template('success.html',{})
    else:
        userform = UserCreationForm()
        RF = RegForm()
       
        return render_to_response('register.html',{
            'uf': userform,
            'rf': RF,
        })

    return render_to_response('regcheck1.html',{})

regcheck1.html

<form method="POST" id="greatform" action="/cd/registration/register/">{% csrf_token %}
        {{ rf.as_p }}
        {{ uf.as_p }}
        <p><input type="submit" value="go"/></p>
    </form>

The user model is getting saved with username and password but the userprofile isn;t :(

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