Leighton Meester Style Through the Years

When Leighton Meester steps onto the red carpet, she's a fashion force to be reckoned with. The Gossip Girl's ensembles get more and more refined with each event. She's constantly switching it up, that's why she's refreshing to follow. So, in honor of the style star's 25th birthday tomorrow, we're celebrating with a look at her fashionable evolution — from the basics to the ultra-glam, and everything in between — here are 50 of Leighton's most memorable!