I must admit that I didn't, however lots of people did and here is an article about it :

http://www.dailymail.co.uk/tvshowbiz...ot-Talent.html

They'd have gotten away with it as well had they picked a woman with bleached blond hair to sit in Alesha's seat.

Oh interesting, I watched on catch up and skip the dull bits so I didn't see it in the first place

It is not fake at all, it was the right thing to do after they screwed up J-Unity's performance with the sound. In the rehearsal footage the sound was good, the headset mic was white and working well but I guess someone had the bright idea to change it to an different black one they dug out to match the guys skin colour. Jody in Meat Diva got the decent white headset mic last night.

It's the rehearsal footage.