Singer IU showed off her slim thighs for a colorful photoshoot with sports brand 'Le Coq Sportif', which�she modeled for alongside actor Song Joong Ki. The theme for this photoshoot was 'summer sports couple'. The popular stars are seen with various fun props, while dressed in bright outfits that really exuded a fresh feel throughout the pictorial. It's reported that IU and Song Joong Ki, who were acquainted through variety programs, enjoyed each other's company during the photoshoot. Representatives of the photoshoot revealed, "There was continuous laughter in the studio throughout the shooting." Watch the adorable behind-the-scenes video of IU and Song Joong Ki's photoshoot for the 'Le Coq Sportif' summer collection! [gallery columns=4] Source: Sports Chosun via Nate