Credit: Albert Michael/; Stephen Lovekin/Getty; Brian Ach/Getty

Leighton Meester knows how to grab people's attention on the red carpet -- though not always for the right reasons.

Whether she's wearing a Louis Vuitton ensemble to the MET Costume Institute Gala in NYC or a lacy Marchesa jumpsuit to a posh Harry Winston bash, the Gossip Girl star -- who celebrates her 25th birthday on Saturday -- isn't afraid to take fashion risks.

"It's really about a mood, experimentation, being comfortable, and trying new things," she told Yahoo last year. "For the red carpet I think it's all about creating a look head to toe and stepping into a character. The clothes, shoes, accessories, hair and makeup. It all goes together in the look."