Today, our Gossip Girl goes from Upper East Side to less familiar territory, starring in the much-anticipated release of The Green Lantern. Aside from landing an enviable role as Ryan Reynolds's love interest, Lively also plays up her tough-girl side as a fearless test pilot. Of course, here at Fab we've come to know her best as a standout on the red carpet and Serena van der Woodsen's alter ego. So, we're celebrating Blake's blockbuster role the best way we know how — with a look back at 50 of the actress-cum-fashion fixture's most memorable red carpet looks. Click on to see them all before you head to the theater to watch our girl on the big screen.