Having made their�debut on yesterday's episode of "M! Countdown", the two ladies of SISTAR19 have returned with a new set of photos from the set of their "Ma Boy" music video. Posing next to a high end car, the girls transformed into sexy racing girls with skin tight mini-dresses and killer heels. The pictures stunned netizens with their sexy nature, as users replied with comments like, "They're so glamorous looking", "SISTAR19! Their beauty is explosive!", "So gorgeous", and "I bet they'll be getting a CF for a car soon." [gallery] Source: Sports Chosun via Naver