Olivia Wilde Goes Blonde Again!

Credit: Jeffrey Mayer/WireImage.com; Adam Nemser/Startraksphoto.com

Olivia Wilde is returning to her roots.

The star, who is naturally fair-haired, showed off a dramatically lighter look  over the weekend while visiting boyfriend Jason Sudeikis in New York City.

Her blonde 'do is for her role in Rush, which she's currently shooting in London with costar Chris Hemsworth.

This is the second major hair change the actress, 27, has made this year. In January she transformed her style from long and brown to highlighted and shoulder-length.

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In addition to pairing up in real-life, Wilde and Saturday Night Live's Sudeikis are taking their romance to the big screen.

The two stars have been cast in the upcoming romantic comedy Relanxious. Wilde will play an overly anxious woman who meets (although not in person right away) Sudeikis' character, who happens to be agoraphobic.