The lady in question was Lynda (hope I spelt that right), the girlfriend of Tony, Seven Wishes bass player. I believe she's a member of a band called the Tuesdays and was helping out for the evening.
I echo Anders comments on her performance - she certainly rocked !
I think Seven Wishes have a great image anyway but Lynda's presence will raise the bands profile even further.
Here's hoping she's a permanent fixture by the time Seven Wishes hit the UK next May.