Amal Clooney just proved that achieving glossy, expensive-looking hair doesn't require a luxury budget. While attending a Cartier event in Milan, the human rights lawyer stepped out with voluminous waves and a silky, high-shine finish that looked straight out of a high-end campaign. The surprising part? Her ultra-polished look wasn't created with a pricey salon treatment. According to InStyle, hairstylist Dimitris Giannetos used the L'Oreal Paris Sulfate Free Iron Sleek Coat Hair Treatment - a drugstore staple that's currently on sale for just $10 on Amazon.