Rewatched a load of them this week and i can't make up my mind if any of them actually sang live and unaided, Buble included....

How do you tell these days? JLS were clearly not singing completely live, but they were not out-and-out milli-vaniliing either...

Cheryl, JLS and Alex all sang partially live.....

Michael, Robbie and Whitney sung live

Whitney did the same as Cheryl, JLS and Alex. For me it was only Michael, Robbie and Bon Jovi who sang live totally

oh

bon jovi looked like he was miming!!! or maybe it was my tv?

Robbie and Bubble definately sung live the whole way through.
Really unsure about all the rest though!
Im sure Leona and the black eyes peas will sing fully live/

Whitney did sing live, but she only sung 50% of the song, the rest was the backing track, but she didn't mime - if that makes sense!

Robbie Williams and Michael Buble? Was looking at Bon Jovi again last night and not convinced it was live, at least in parts.

Lady GaGa, Leona, Black Eyed Peas and Rihanna will definitely sing live in the future methinks. Rihanna being a possibility.

Robbie, Bon Jovi, Whitney and Michael Buble sang live (funnily enough, all the ones not directly connected with X Factor).

Alex didn't (she mimed to the same backing track on GMTV, which kind of gave it away). JLS partly mimed and partly sang live. Not sure about Cheryl as the vids have disappeared, but I'd say mostly mimed.

Yeah, I know what you mean - she was never pretending to sing when she actually wasn't, but a fair bit of it was filled in with backing track. But she didn't mime as such.

Westlife were completely live