Double check the rules in a simpler format

you and Karyn are transformed into Britney Spears and Chistina Aguillera
you enter a fantasy world identical to the real one except you are now your alter ego's
the contest takes place in a celebrity hotel, in which you must both pass as that celebrity including singing
before you begin you each design 5 'weapons' which do things of your choice, neither of you know each others.
all 10 weapons are hidden in the hotel, you could find one of yours, or your opponents.
the winner wins when the opponents cover is blown, or they submit.