• BEST WAVES  photo | Olivia Wilde

Credit: Stewart Cook/Rex

Published: Monday January 13, 2014 02:00 AM EST



Perhaps the best advertisement for prenatal vitamins (and the best argument for the continued popularity of ombré), Olivia's hair holds its own against her glittering Gucci gown. Stylist Lona Vigi used Oscar Blandi products to give the mom-to-be sexy, side-swept waves with a "rock 'n' roll" feel.