For those of you who thought the undercut was only for the men in your life, think again. The hairstyle is a whole lot sexier when sported by a femme fatale a la Scarlett Johansson. True, this straight hair look isn't for the faint of heart, but it's a fierce, no-fuss option that simply calls for a blow-dryer, volume spray, and a touch of strategic back-combing. Try: Living Proof Full Dry Volume Blast, $29.
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Kate Mara's Straight Bob
The Mara sisters are known for their fearless approach to show-stealing style -- especially when it comes to their hair. And though Kate switches up her hairstyle on what feels like a weekly basis, this chin-grazing bob accented by a sweet, side part is one of our favorites to date. To achieve the look, simply part damp hair with a fine-tooth comb (try: Fromm Diane Ionic Anti-Static Finishing Comb, $2.76) and let hair air-dry to mimic the natural, not-too-perfect texture.
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Lily Collins' Straight Haircut With Bangs
As one of our No. 1 girl crushes, Lily Collins has a flair for gothic glamour that we can't get enough of. Thus, we love the cool juxtaposition of her straight hair, oomphed-up locks and piece-y bangs. To maintain face-faming fringe and keep the look polished, we recommend a pint-sized flat iron like the Mighty Mini Coral Pink Styler, $29, from Amika.
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Julianne Hough's Slicked-Back Look
While we're not sure if we can get on board with the soaking wet, just-out-of-the-shower look that we've seen on some stars as of late, we're totally obsessed with Julianne Hough's sleek, straight hairstyle -- a slightly more subdued version of the slicked, wet trend. Plus, it's the perfect antidote for those mornings when you're racing to get out the door. Start with damp hair and brush hair straight back. Then, blow dry strands to stay in place, and finish with an ultra-shiny pomade or oil, like Oribe Gold Lust Nourishing Hair Oil, $52.
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Olivia Culpo's Sleek Ponytail
For a high-glam solution to second- (or third- or fourth-) day hair, Olivia Culpo's super-polished straight ponytail gets the job done. To start, create two small braids on both sides of your head. Once you reach the crown, secure the braids with the rest of your hair and gather into a sleek, ultra-high pony.
