Olivia Wilde has been a brunette for so long, many fans may have forgotten that her natural hair color is significantly lighter. ... the actor has been dying her blond hair brown for over a decade.

Olivia Wilde shared an Instagram photo from 20 years ago. Olivia Wilde/Instagram. The star, who currently has light brown hair, has been posting lots of new looks on Instagram as of late.

Olivia Wilde looked gorgeous in a sheer black dress at the Saint Laurent show ... Olivia had her brown hair down and parted in the middle in her signature loose waves while a sultry smokey eye ...

Olivia Wilde looked stunning as she carried out her errands in Beverly Hills as rumours of a reconciliation with Harry Styles ... light brown hair flowing in the wind and her friend by her ...

Olivia Wilde always manages to nail casual chic street style. The actress, 39, was spotted out in Hollywood laughing with friends grabbing dinner at L.A. hotspot Saffy’s. She took animal-print ...

Olivia Wilde, Zoë Kravitz and ... Wilde paired the bodysuit with a brown pencil skirt, ... She paired the look with diamond earrings, and wore her hair in a slicked back bun.

Olivia Wilde/Instagram. In the selfie pic, Wilde — who wore a simple white sweater and gold chain — smiled at the camera with her head turned to one side and her hair tied back.