By InStyle Staff
Mar 10, 2012 @ 9:00 am
Byron Purvis/AdMedia/Retna; SGranitz/WireImage

Today is Olivia Wilde’s 28th birthday! To celebrate her big day, we're taking a look at her beauty transformation, from fresh-faced blond to a red carpet head-turner. See Olivia's best looks through the years in the gallery.

MORE:• Try on Olivia's Latest HairstyleGet Olivia's Pretty Pink LipsSee Photos From Olivia's Revlon Shoot