performance, she performed a costume change so amazing it must be magic.For the majority of the set, is seen wearing a white floor-length gown. But as she approaches the big, climactic vocals that punctuate her divorce power balled “Penthouse," Ballerini briefly disappears into a cloud of smoke before reappearing in a Posh Spice-style black strapless mini dress.This content can also be viewed on the site it from.This content can also be viewed on the site it from.This content can also be viewed on the site it from.This content can also be viewed on the site it from.Here's what probably happened: Ballerini removed the white gown to reveal the strapless mini hiding below, then handed the outer garment to a crew member ready to snag it from a trap door under the stage.