The gal pals of 'The Sisterhood of the Traveling Pants' are back in an all-new sequel and ET is with the stars! America Ferrera, Blake Lively, Alexis Bledel and Amber Tamblyn, who have all achieved great success, open up about how their lives have changed in the three years since the original hit theaters in 2005. 'The Sisterhood of the Traveling Pants 2' opens on August 6.