Extending Profile with a ForeignKey field

Hi,
I want to add a ForeignKey field in UserProfile. Sth like this:

****

from myapp.models import Person
class Profile(models.Model):

user = models.ForeignKey(User, unique=True,
verbose_name=_('user'))
name = models.CharField(_('name'), max_length=50, null=True,
blank=True)
about = models.TextField(_('about'), null=True, blank=True)
location = models.CharField(_('location'), max_length=40,
null=True, blank=True)
website = models.URLField(_('website'), null=True, blank=True,
verify_exists=False)
person = models.ForeignKey(Person, unique=True,
vervose_name=_('person'))

****

But in Signup form, I got this error:
IntegrityError
profiles_profile.person_id may not be NULL

What should I do?
Thanks

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