Last night's British Fashion Awards brought out our fave style stars—Alexa Chung, Kate Moss, Harry Styles... We, however, were laser-focused on one thing: Sienna Miller's pink locks. The Brit babe joins a long line of leading ladies to rock a pink hue: Lauren Conrad and Rachel McAdams, we’re looking at you. But Sienna’s rose gold highlights were a sophisticated and subtle take on the trend. Paired with an emerald Burberry gown, this was a hair dye home run.