Jessica Biel
Credit: WireImage (2);; FilmMagic

Jessica Biel turns 31 today! Justin Timberlake’s better half often makes our Look of the Day list choosing stylish pieces even the designers themselves fawn over. "Jessica is a great chameleon," Giambattista Valli, the man behind Biel's gorgeous pink wedding dress, told InStyle. "She can do the Venice Beach surfer look one minute and divine diva the next." And whether she's wearing separates, shifts, or stunning gowns, the birthday girl always looks fashionable in her red carpet styles. Click through the gallery to see more of her best looks ever!