Julianne Hough! The star shared a whole host of snapshots and videos from her trip to Sin City on Instagram, including one clip which had wardrobe malfunction written all over it.The professional dancer looked incredible with longer blonde locks and a tiny pink mini-dress as she partied with her friend and business partner, Nina Dobrev. SEE: Julianne Hough looks like a mermaid with waist-length hair But her high energy dance moves were restricted by her plunging, thigh-skimming dress as she