I thought it was performed just right, for Kat. The problem is that we're used to hearing it in a musical or a movie, so it had to be rearranged from that. If anything, it provided a stark contrast from Clive's pick, which she Celined like there was no tomorrow.
For the record, I had Elliott and Kat about even, but the fact that she was bottom two plus the boobs may give her a slight edge to stay.