Spotted: A Gossip Girl star on top of the world in her new Reebok ad campaign. Leighton Meester has partnered with the sportswear company for a new footwear line that will feature fashion forward styles in bold colors and sporty silhouettes for the urban girl–and who better to showcase this new line than the ultimate city girl? In the ads, Leighton will be showing off the new retro Top Down sneaker, part of Reebok’s Fly Generation collection. The Top Down, $60, will be available at all Lady Foot Locker Locations. Leighton will be in all in-store signage and print ads for the company starting this spring. Tell us: What do you think of Leighton Meester’s Reebok ads?