What She's Done: She was one-fourth of the 'Sisterhood of the Traveling Pants,' and had arguably her first grown-up role this year in 'The Town,' in which she played Ben Affleck's drug-addicted ex-girlfriend. Still, this 23-year-old beauty is probably best known for her role as Serena Van Der Woodsen on the TV series 'Gossip Girl.'
What's Next: Lively will play Ryan Reynolds's love interest in the highly anticipated 'Green Lantern' movie, which could turn this TV actress into a legitimate movie star.
Did You Know? Her half-sister is actress Robyn Lively, star of the '80s cult hit 'Teen Witch.'