Pandas Add Index to MultiIndex

I am creating a MultiIndex using the following code:

idx = pd.MultiIndex.from_product(    [df['Day'].tolist(), ['A','B','C']],     names=['Day', 'Status'])

Which creates:

MultiIndex([('01-Jun', 'A'),            ('01-Jun', 'B'),            ('01-Jun', 'C'),            ('02-Jun', 'A'),            ('02-Jun', 'B'),            ('02-Jun', 'C')],            ...       names=['Day', 'Status'])

How would I insert a static index at the beginning so the output would look like:

MultiIndex([('VALUE1', 'VALUE2'),            ('01-Jun', 'A'),            ('01-Jun', 'B'),            ('01-Jun', 'C'),            ('02-Jun', 'A'),            ('02-Jun', 'B'),            ('02-Jun', 'C')],            ...       names=['Day', 'Status'])