Gossip Girl Stars: Then and Now! Who’s Changed the Most Since Season 1?

Like her co-star Leighton, the biggest change in Blake Lively’s (Serena) appearance has more to do with a difference wardrobe than a significant change in physical features. Blake’s still leggy, blond, and youthful as ever — but her sexy schoolgirl wardrobe is certainly a thing of the past. These days, S is all about the glitzy designer fashions and grown-up ensembles. No more plaid skirts and pleats here!