You need to lay out all your fields, if you want to control the wrappers:
from crispy_forms.helper import FormHelper
from crispy_forms.layout import Layout, Fieldset, ButtonHolder, Submit, Div
class AuthenticationForm(forms.Form):
def __init__(self, *args, **kwargs):
super(AuthenticationForm, self).__init__(*args, **kwargs)
self.helper = FormHelper()
self.helper.form_class = 'form-horizontal'
self.helper.label_class = 'col-lg-3'
self.helper.field_class = 'col-lg-8'
self.helper.layout = Layout(
Fieldset(
'fieldset description text',
'username',
'password',
),
Div(
Submit('submit', 'Log Me In', css_class='btn btn-default'),
css_class='col-lg-offset-3 col-lg-9',
)
)