Jennifer Lopez is only a week into her Vegas residency, and she’s already working her butt off — literally. During last night’s performance of “All I Have,” J.Lo took a final bow that no one will forget. As the singer thanked her fans and took her final bow, she suffered a wardrobe malfunction and split her pants. Yup, right up the middle. J.Lo didn’t seem to notice the breeze that most likely hit her backside.