Demi Lovato Las Vegas- Arabstoday Demi Lovato attended the “iHeartRadio” event at the MGM Grand Garden Arena in Las Vegas. The young actress looked stunning in a little black patterned dress from TopShop that revealed her slender legs. She styled the sexy and elegant dress with matching platform pumps, her blonde hair was styled straight and she donned heavy make-up. Demi recently appeared on Katie Couric's new talk show, where she talked about her time in a treatment facility.