Sibling rivalry never looked so good.

Now that they're officially family, the Sloane sisters are stuck living together in an Upper East Side town house and sharing everything - from cute clothes to even cuter crushes. Is New York City big enough for all four of them?

Cate: The once and future queen bee of Ashton Prep is at war with her ex-besties. Cate's weapon of choice: the hottie next door. Because nothing says social dominance like serious arm candy.

Stella: London's former It Girl is tasked to recruit cool friends for her and Cate's new crew. Her mission: Make a nobody into a somebody. But will her protÉgÉe measure up? Or has Stella created a monster?

Andie: The petite beauty has what every girl wants: a crush who likes her back. Too bad he was stepsister Lola's crush first. Um, dibs!

Lola: The class klutz is defying her rep by embarking on a high-fashion modeling career. When she becomes the muse of the craziest man in fashion, will Lola end up runway worthy or style roadkill?

Style. Sabotage. Sisterhood.