Happy Birthday, Olivia Wilde!

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 Hairstyle• Get Olivia's Pretty Pink Lips• See Photos From Olivia's Revlon Shoot