Blake Lively has a lot of things under her sleeves. Some of her milestones in acting are:

a. 2005 - Made professional acting debut in "The Sisterhood of the Traveling Pants," with Amber Tamblyn and Alexis Bledel
b. 2006 - Played Justin Long's object of affection in the comedy "Accepted"
c. At 10, played the Tooth Fairy in "Sandman," a film directed by her father Ernie Lively
d. Will play a beauty queen in the dark comedy, "Elvis and Anabelle" (lensed 2006)

Source: http://movies.yahoo.com