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Michelle Trachtenberg’s hair now has bright blue ends, and it’s all because of her new role as a psycho killer in the thriller The Scribbler, out next year. “It wasn’t even something they asked me to do, I just said ‘I think half my head should be blue,’” she told us at the Coach-hosted Childrens Defense Fund benefit party in Santa Monica last night. While producers denied a full head of blue hair, they compromised with just the tips, and Trachtenberg sought celebrity colorist Tracy Cunningham to dip-dye her strands. “We did it and it’s been so much fun,” she said. Of course, it took some getting used to. “It is super subtle though during the day it is a bright,” she said. “But after the first washing, I thought I killed one of the characters from Avatar!” Tell us: Do you like her look?

Plus, see more celebrity hair makeovers!

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— Kwala Mandel

InStyle’s June issue hit newsstands today, with the ever-glamorous Charlize Theron gracing our cover. In celebration, we added the star’s cover ‘do to our Hollywood Makeover Tool, so now you can see yourself in Theron’s side-swept waves. Simply upload your picture for an effortless blond bob in five seconds flat, then be sure to share your makeover on Facebook and Twitter. Head over to our Hollywood Makeover Tool to get started.

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• InStyle Cover Girl: Charlize Theron
• See Charlize’s Best Outfits Ever!
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Is your hair color DIY? The “at-home colorist” is on the rise, as sales of do-it-yourself hair color reached almost $1.9 billion last year, The Wall Street Journal reports. At roughly $10 per kit, that’s almost 190 million boxes! We want to know: Do you dye your own hair? Tell us in our poll below!

Plus, see 11 tips you need to know before dyeing your own hair.

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• Berenice Bejo Goes Brunet!
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• Which Celebrity Hair Color Is Your Favorite?