On Tuesday’s episode of “The Voice,” Christina Aguielera traded in her usual full-bodied waves for something a little sleeker—an Asian-inspired top knot that, paired with her perfect platinum shade, definitely hit all the right notes. The man behind her mane? That would be celeb stylist and International Creative Director for Macadamia Professional, Giannandrea. How’d he get Christina looking so sharp? He shares his how-to below!