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 .