Yes she looked great, but I do not know why she was acting like an over excited teenager. I do have a great amount of respect for Kylie, but she did not do herself any justice on the show.
Lets hope that she calms down a bit and it was just first show nerves/excitement.
By the way I completely disagree with scrivens comment about Jessie J. She has an amazing voice, personally I think that Kylie's voice is quite weak (although I do like her music and think she is cool - except for last nights performance) if you put both singers on together you would see who is the powerhouse!