As you know if you watch Gossip Girl, Leighton Meester plays Blair Waldorf, the preppy, prim and proper high school queen of New York's Upper East Side.

In real life, the beautiful 23-year-old actress is much more of a style chemeleon, making a variety of different looks work for her. But which works best?

At the recent Star Trek premiere in L.A., Leighton arrived with blonde highlights, smoky eyes and pale lips. Only a few days later, she went the high fashion route at the Met Gala, playing down her eyes and painting her lips glossy red.

Which look do you think worked best for her? Tell us below ...

Gossip Girl's Leighton Meester looks best with ...