American actress Leighton Meester is best-known for playing bad girl, Blair Waldorf in the hit American TV show, Gossip Girl. Her character's smart, preppy outfits - and obsession with headbands - has fascinated fans as much as her competitiveness with Serena van der Woodson, played by Blake Lively. Off set, she's also considered a fashion queen although her day-to-day dress is much different to Blair's. Leighton is a bit of a style chameleon. Over the years she's nailed pin-up girl in Dolce and Gabbana, Grecian goddess in Missoni, high fashion in Chanel and even floral ruffles in a super-short dress by Marc Jacobs. If there's a trend, you can guarantee Leighton will give it a go! She also has her style staples: pretty and relaxed casual pieces worn by day with flats but we prefer her in all out fearless fashion. After dark, she often changes in to an elegant yet edgy dress by Vera Wang or Louis Vuitton acessorised simply with a pair of Brian Atwood heels. Leighton seems to have a thing for European designers. Most recently, she's been showing off her modeling credentials for Missoni's SS12 ad campaign.