On her whirlwind promotional tour for Sin City: A Dame To Kill For in New York yesterday, Jessica Alba showed how to stare down the challenge of dressing for three events in one day. Her answer? Trick everyone in to thinking you've had three complete style overhauls, when in fact you've pulled in one or two outfit game changers and the rest has stayed the same. Sound easy? It is. Look knockout? She does. Here's how to capsule like an A* Alba.