These two ladies NEVER expected to be on stage in the first place, and then to have Keith Urban call his wife to join them!
I love when he asks at the beginning of the video 'where are you from?' and the answer 'the suburbs!' LOL!
They tell him he has to visit, and he asks if he can bring his wife.. which of course leads to him bring Nicole up on stage too.
Obviously an experience Amy and Christina won't soon forget.