Abs-olutely fabulous! Jennifer Lopez, 41, shows off her toned stomach as she promotes new Blackberry Playbook

By DAILY MAIL REPORTER Ab fab: Jennifer Lopez proved that she still had the abs of steel she maintained before the birth of her two-year-old twins, as she promoted the new Blackberry Playbook at Best Buy today Jennifer Lopez proved that she still had the abs of steel she maintained before the birth of her two-year-old twins Max and Emme, today.The 41-year-old singer flaunted her incredible torso