Apparently her heel got caught in the hem of her extra-large shirt, landing her on her butt. Fortunately Carrie didn't break anything, but took the opportunity to poke fun at her self on Twitter. "Hey, remember that time in Corpus Christi when that girl busted her butt on stage?! Hilarious. Oh wait, that was me! Good news, it's not broken… And I got some new footwear."