Jennifer Lopez showed off her fit figure in two sexy ensembles last night while filming a segment on the Argentinian TV program Dreaming For Singing in Buenos Aires. J Lo debuted shorter locks earlier this week, but yesterday she was back to her usual look. She wore an embellished LWD for her interview, and changed into one of her stage costumes to perform. J Lo's currently traveling through South America on tour, and will link up with Enrique Iglesias and Wisin & Yandel next month for additional dates on her Dance Again travels. The demanding schedule has apparently caused J Lo some back pain. The singer tweeted about pulling a muscle after exerting herself carrying twins Max and Emme.