Still not completely convinced.
The beginning of Firework, for example....when she sings "feel so paper thin", you see her take a breath at the end of 'thin' while the word 'thin' is still being sung: http://www.dailymotion.com/video/x2g6jpw
I did notice a good portion of it was lipped but that video doesn't help your cause because it's off sync by a second or so.
I'm much more inclined to believe the person that was actually a part of the rehersals and show than some pressed souls trying to find any way to discredit Katy
This is getting sad lmao. Roar was the most obvious part, I'm pretty sure she has NEVER hit that high note well during an actual live performance and suddenly she slays it at the SB, can belt the high notes in IKAG and can perfectly sing the Firework verses after running around stage for 10 minutes? Bye!