Olivia Wilde's Beachy Waves by David Babaii

David Babaii explains how to achieve this look:

To create Olivia's soft beach waves, I began by applying Couture Colour Pequi Oil Treatment through the hair before drying. For the bang area, I used a large paddle brush to create a sleek finish. Next, I created 3 sections (sides and nape) for total control. Starting at the nape area, I took 2" sections and wrapping them around the inside of a large barrel curling iron and securing with pins. After curling the entire head and allowing the sections to cool, I removed the pins allowing the curls to fall naturally. To finish, I applied an additional amount of Pequi Oil to my hands and gently brushed the curls out using my fingers, allowing her curls to fall into a natural wave pattern. Then, I finished her style by applying additional Pequi Oil for enhanced condition, strength and shine without weighing it down.

Image: Jason Merritt/Getty Images