Here's the stage we saw. Clearly they were going to great lengths to make the place look elegant and in keeping with the Hollywood theme.
This video, made the morning of the dress rehearsal, has almost our final choreography. It turned out that during the actual dress rehearsal that evening one of the tumbling moves just wasn't working right and there was too high a possibility of a fall, so we took it out the next day (Kim did). However, in this video you see what we originally intended (the first tumbling move is the one later removed).
Below Kimberly is seated during the dress rehearsal Thursday evening. This is, indeed, the costume she wore during the competition.