Style. Sabotage. Sisterhood.

When Cate and Andie Sloane's Upper East Side dad met Stella and Lola Childs's British-model mom, nobody thought a transatlantic relationship would last. But then their parents drop the M-bomb - marriage - and it looks like Cate, Andie, Stella, and Lola are going to be one big happy family. Well, big anyway. Meet:

Cate Sloane: She dominates the ninth grade at exclusive Ashton Prep. Tantrum-prone and competitive, Cate would rather wear Laura Ashley every day than be second best at anything. Luckily there's not a rival in sight. Yet.

Andie Sloane: Twelve-year-old Andie desperately wants to walk the runway. Her face is flawless, and boys flock to her like love-struck sheep. There's just one leetle problem: She's only 4' 11". But with a new supermodel stepmom, she'll be voguing in no time. Right?

Stella Childs: With her take-charge attitude and a closet full of supermodel swag, Stella was the It Girl at her London middle school. She's determined to rule Ashton Prep - even if that means dethroning the current queen bee. Can you say British Invasion?

Lola Childs: London boys called gawky Lola "Sticks," but she's got a new mission in Manhattan: boyfriend or bust! With the help of her boy-magnet stepsister, Lola sets her sights on supercute Kyle Lewis. Too bad Kyle's only got eyes for . . . Andie.