Iluvbertie
Imperial Majesty
- Joined
- Jun 29, 2004
- Messages
- 14,459
- City
- Bathurst
- Country
- Australia
We have the evidence from the CC (approved daily by The Queen) and the official programme for William's wedding that Louise is Lady Louise Mountbatten-Windsor. That is how she was referred to in both places on that day - so that is good enough for me to say that Louise's surname is Mountbatten-Windsor as the authority for that is The Queen herself.