To clear things up, the producer spend tonnes of money to invite her to the show to make show more 'international'. The show is for professional singers/established artists, with one or two newcomers put in to attract more views. The singers are only allowed to sing one of their own song, then covers other songs preferably with their own arrangement. They dont win anything but exposure, so its a good platform for has-been performers to remind the public 'hey i'm still alive and killing ass'. For Jessie J is a good place for her to expose to asia market.