Jennifer Lopez may be on the heels of a recent breakup, but she still knows how to rock a red carpet! On Friday, September 6, while attending the Toronto Film Festival for her newest flick, Unstoppable, the “On the Floor” singer dazzled in a revealing, floor-length Tamara Ralph dress fastened at the sides with large, black bows. She accessorized the fabulous look with jeweled strappy heels and a metallic silver clutch. The brunette beauty’s long hair hung loosely around her shoulders as she posed for the cameras. This marks Lopez’s first major red-carpet appearance since it was confirmed she’d…