I'm a little confused but correct me if I'm wrong, Katy started performing (with her mic on) but they played the studio version instead of the instrumental so they stopped her and let her restart? Messy.
Sounds like the first time around maybe her mic messed up and it wasn't working so she was singing along without knowing? Then they realized she wasn't singing 'cause of the mic messing up so they let her start over.
The massive difference between the studio version and her singing live, though.
She wasn't lipsyncing. I think stereo.love is right. They accidentally played the studio version instead of the backin g track or something. She never lip-syncs. Messy.
She had to restart because on they played the studio version on TV instead of her singing and it started way before she went on stage so it was totally out of synch and really embarrassing
It wasn't like in the LQ version !!!