[Z]

Christina would overshadow Cher and One Direction, so she's surely with Matt or Rebecca. I really hope Robbie isn't duetting on the final, he was a wreck when Take That performed on the results show earlier in the series, looked like he was on drugs to me, that aside he was pretty shocking and I think he would ruin One Direction's chances of winning (which, don't get me wrong, is a good thing IMO, but it's unfair on them) and would leave it up to Matt or Rebecca to win. I can't picture Rihanna/Rebecca at all, so she's surely with Matt, will.i.am is obviously going to duet with Cher if he's on... so I think Christina/Rebecca singing something like Hurt, Rihanna/Matt singing something like Russian Roulette, will.i.am/Cher singing whatever abomination he's done recently and Robbie/One Direction doing She's The One as somebody else already mentioned. Interesting... It's hard to gauge if Rihanna's current popularity would steal the win for Matt or if Christina's superior vocals would win it for Rebecca.