Nikki Reed (Rosalie Hale)

Then: Twenty-year-old Reed became an instant hit as the teenage star and co-author of the independent film "Thirteen," based on the actress' own real-life experiences.

Now: She's set to star in two movies -- "Privileged" and "Last Day of Summer". But she'll have her hands full playing icy vamp Rosalie if the "Twilight" sequels get the green light. (Wireimage)