Ciara's hosting the Billboard Music Awards [1] for the very first time, and from a style perspective, she already nailed it. Showing off some tasteful side boob and a thigh-high leg slit, her slinky, shimmering Philipp Plein number hung like a sheath, highlighting the star's every curve. Read on to see Ciara's first look of the evening, complete with metallic ankle-strap Casadei heels and an effortless hairstyle [2], and stay tuned for multiple sexy outfit changes ahead [3].