Lively's hair on Gossip Girl should have gotten its own show. With its multiple personalities (up, down, wavy, straight), her hairstyles effectively mirrored her character's different moods. But it's her signature look — down, loose, wavy — that had fans asking for the Serena cut. The actress' secret? When hair is still damp, twist it into a ballerina bun. "When the hair is released, it has a nice natural deep wave," she told website Refinery 29.