When Nicole Kidman walked into the 98th Academy Awards, we thought her dress would steal the show. But her hair was equally showstopping, and her trick is available to all of Us. The exact conditioner used on Kidman is hiding right on Amazon! In an Instagram post, Kidman’s stylist showed the routine that left her signature strawberry-blonde hair sleek, smooth and voluminous, looking perfectly suited for a hair commercial. Despite color treatment…