Ness, I read yesterday that Miley's camp was shocked at her performance - that what she did in rehearsals was lots of hints, but much tamer. If that is true, then it is POSSIBLE that Robin was not in on it either. After reading that, I re-watched the performance, and it's hard to tell if during her big moment he was surprised and trying to go along to be professional, or if he knew exactly what was going on. I saw surprise in him, but I'm not sure if I was reading that in to it or if that was the case. After that portion of the performance, Robin got away from her and the camera tried to ignore her. So it's possible that Miley amped it up on her own.