Ah, the wonders of a great pair of jeans. It can make even those of us non-model types look trim and shapely.

The Girls of "Sisterhood" Credit: Warner Bros.

And in the case of The Sisterhood of the Traveling Pants, it also can help four teenage girls cope with a multitude of growing pains -- from finding first love to a parent's remarriage.

The result is a film that will make tween girls squeal and sob in all of the right places, despite its predictability.

America Ferrera, Blake and Amber Credit: Warner Bros.

Based on the book by Ann Brashares, The Sisterhood of the Traveling Pants focuses on Carmen (America Ferrera), Tibby (Amber Tamblyn), Lena (Alexis Bledel) and Bridget (Blake Lively), four best friends who are spending their first summer apart since their pregnant mothers took the same aerobics class.

Before everyone parts, they find a pair of pants in a boutique that mysteriously fits their different body shapes. The girls decide to share the magical pants during the summer, mailing them with notes on their adventures.

America Ferrera Credit: Warner Bros.

Carmen is heading to South Carolina to spend a whole summer with her father, who left her mother when Carmen was a child. Ferrera, who was excellent in Real Women Have Curves, shines as the half- Puerto Rican daughter who doesn't fit in with her father's new blonde family.