Jennifer Lopez rocked a sports bra yesterday on the Mexico set of her new music video for the song "Follow the Leader." Her boyfriend Casper Smart was on the scene as well, stopping to engage in some PDA with J Lo from time to time. They're in Acupulco tweeting all about their adventures with collaborators Jessy and Ulysses Terrero. Puerto Rican duo Wisin & Yandel were also on hand to shoot, as they collaborated with J Lo on the song. The gang was up early today to start their third morning of production. Jennifer recently released another clip showcasing her Jennifer Lopez collection for Kohl's. On top of her music and fashion, J Lo's also prepping for the release of her new comedy What to Expect When You're Expecting.