Olivia Wilde: Chris Hemsworth and I Competed Over Our Hair!

USMagazine, Monday, April 23, 2012, 2:15pm (PDT)

When Olivia Wilde took on the role of 1970s supermodel Suzie Miller for the upcoming film Rush, she had to lighten her hair and get a retro shag cut.

And apparently her gorgeous makeover sparked some on-set jealousy from co-star Chris Hemsworth, who plays Formula One racer James Hunt in the Ron Howard directed flick.

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"We competed over haircut and hair color, but I think he won," the 28-year-old actress told Us Weekly at the Tribeca Film Festival premiere of Deadfall in New York City Sunday. "He has an amazing head of hair!"

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

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Last month fans got a look at Wilde and Hemsworth engaging in a passionate kiss while filming a wedding scene for the movie, but in real life she's dating SNL funnyman Jason Sudeikis.

This article originally appeared on Usmagazine.com: Olivia Wilde: Chris Hemsworth and I Competed Over Our Hair!