I saw it last night, and as soon as she walked on stage I thought she looked like she loved herself. Thing is, she looks great (hair, body, face) but she strutted on the place as though she was the best thing since sliced bread.
I don't know much about Joss Stone, but when I heard her speak I thought, "Is she American? I always thought she was British!" hahahaha!
She didn't stand at the plinth either. She paraded up and down and tried to interact with the audience at the front and tried to be funny. It was actually quite awkward to watch.