Another full-length performance by Christina Aguilera from the upcoming film "Burlesque" has emerged, this one being for "But I Am A Good Girl". The song & the clip may be a little cheesy overall, but it's all very fitting, so I ain't mad! Meanwhile, the first single "Express" from the movie--one of Christina's numbers--has premiered (listen below). I'm sure you've heard part of its fabulousness in the trailer! "Burlesque" hits theaters on November 24th, with the soundtrack arriving two days prior.