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Don’t call it a comeback—the bob has been here for years! The style has been a standard since the 1920s, but stars like Jennifer Lawrence, Nikki Reed, and Katharine McPhee recently gave the classic look new life. Christina Hendricks is the latest celebrity to jump on the trend: She debuted her new ‘do at Mad Men event in New York City, and proved that the versatile cut works on just about every face shape. Inspired to make a similar change? Print out a picture of the version you like best so your stylist can tailor it to suit you. The choppy sections should be cut opposite in proportion to your face shape—square or round faces are balanced by longer layers, while longer face shapes can go with shorter pieces.

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• Details on Jennifer Lawrence’s “Shag” Haircut

In case you haven’t already heard, Jennifer Lawrence cut her hair over the weekend. Even though the transformation happened mere days ago, we’re already declaring the style a phenomenon—and our readers agree. We asked you to vote yay or nay on Lawrence’s crop, and 70% of you voted that you love her new look. Reader Rachel Klopp wrote on InStyle’s Facebook wall: ”Love it! She always looks perfect,” a feeling echoed by dozens of other readers. And it’s no surprise to us—the length combined with her warm highlights are flattering on almost everyone. ”The color is a medley of sandy blonde ribbons amidst a background of caramel and honey,” her colorist Lorri Goddard told InStyle.com. “It works well on Jennifer because it accents her beautiful features.” Want to plan a similar shift in shade? Keep your undertones in mind. A good indicator is to see the type of jewelry you favor. Warm skin tones are flattered by gold jewelry and should opt for equally-warm, golden tones, while cool skin tones are a better pair to silver jewelry and ash-based hair hues.

See more celebrity hair makeovers in our gallery!

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• Try on Jennifer’s Many Pretty Hairstyles
• Sign Up for InStyle’s Hair Newsletter
• Details on Jennifer’s New “Shag” Cut

Jennifer Lawrence can do no wrong! Everyone’s celebrity BFF surprised us by unveiling a covetable long bob this weekend, so we caught up with her hairstylist Mark Townsend to get all the details on her new cut. “I love this shag on her! Jennifer can go straight for a super-chic look, or wavy for a fun, playful style,” Townsend told InStyle.com. “Plus, it’s long enough so she can still wear her hair in a short ponytail or updo.” If Lawrence has you inspired, be sure to bring a picture to the salon so your stylist can recreate her choppy, face-framing layers and long bangs. To form her waves, Townsend applied Dove’s Whipped Cream Mousse ($5; drugstore.com) to Lawrence’s damp strands and blow-dried using a round brush. “I took random sections of hair and wrapped them around a one-inch curling iron,” he said. “To finish, I sprayed Sally Hershberger Texture Blast ($24; sallyhershberger.com) on the ends for that cool, piecey look.” We love it—this length allows such versatility!

See more celebrity hair makeovers in our gallery!

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• Try on Jennifer’s Many Pretty Hairstyles
• Sign Up for InStyle’s Hair Newsletter
• The Catching Fire Trailer: 5 Style Moments