On the heels of her sequined Oscar de la Renta tunic-and-trousers look in NYC, Jessica Biel switched things up — twofold — at the Hitchcock LA premiere last night. First, she opted for the kind of red-carpet glamour that's both daring and dramatic, wearing a black ruffled-front Gucci gown and a yellow Fendi clutch. What you can't see (from this angle) is the dress's jaw-dropping back cut-out and central slit, which injected all the more evening appeal. Then, in true after-party form, she ditched the longer hem length and donned a boxy, pleated Michael Kors LWD with rose-gold metallic pumps, Fendi clutch intact. Both numbers are equally gorgeous, so this time, it really comes down to how you prefer your star-studded style. Are you a fan of dark, elegant silhouettes, or do you prefer a more playful minidress? Weigh in on Jessica Biel's quick-changing ways below.