Demi Moore took to Instagram to share her pride in middle daughter Scout Willis, 30, as she revealed some very exciting news.MORE: Demi Moore's fans can't get enough of her slinky backless jumpsuitShe posted a video featuring a teaser for Scout's upcoming second single, Shouldn't I Be, which featured her posing in a series of stunning looks.WATCH: Demi Moore's garden looks like a private nature reserveScout wore a 20s style dress with dangling feathered detailing and crystal trims, similar to Cher's iconic Bob Mackie creation, as well as a white dress with chainmail on the side sporting a bloody nose.She also posed in a risqué chainmail ensemble, featuring a top that barely covered her up and a skirt with appliques, a sword, and a bob hairstyle, that also featured as the single art.MORE: Rumer Willis' jaw-dropping new appearance sparks big reaction from fansDemi wrote a loving caption for her daughter, saying: "So proud of @scoutlaruewillis - releasing her second single 'Shouldn't I Be' on March 4.