forms.py

class CreatePerson(forms.ModelForm):
    class Meta(object):
        model = Profile
        fields = ('username', 'password', 'first_name', 'last_name', 'email', 'City', 'Sex', 'Age',)                                # exclude
        labels = {
            'username': 'Введите желаемый логин',
            'password': 'Пароль',
            'first_name': 'Имя',
            'last_name': 'Фамилия либо Отчество',
            'email': 'Почта',
        }
        help_texts = {
            'username': (''),
        }
        widgets = {
            'password': forms.PasswordInput(attrs={'placeholder': 'Pass'}),
        }

    def __init__(self, *args, **kwargs):
        super(CreatePerson, self).__init__(*args, **kwargs)
        self.fields['Sex'].empty_label = 'choose'
        validators=[EmailValidator(message="Your message")]

        for field in self.fields.itervalues():
            field.widget.attrs.update({'class':'user'})