Midi skirts — that's a hemline that hits below the knees but above the lower calf — are an easy way to inject ladylike flair to your style. Since the style is notoriously tricky to pull off without feeling conservative, overly covered up, or, at worst, frumpy, we have the key tips on how to make this skirt flirty and fun (and office-appropriate, if that's what you need). Including solid, printed, muted, and bright colored styles, we culled 14 of our favorite picks for you to shop. But first, a few quick styling tips to help you nail the look every time.

• We've focused on the classic circle silhouette because it's the most universally flattering.
• Pleated waistlines can make you look wider at the hips, so look for a flat-front with an A-line shape if that's your problem area.
• If you're on the taller side, go for a skirt that hits the calf, and if you're petite, choose one that's right below the knee.
• Midi skirts look great with heels to help lengthen the leg, but a sweet flat or strappy sandal gives it a softer feel.
• To balance out the longer hemline, we recommend pairing your midi skirt with a shorter, even cropped, top, or just try tucking your tee in.

While catching a flight out of LA with husband Justin Timberlake, Jessica Biel gave her new white Nike Dunk Sky Hi sneakers ($125) a sophisticated spin. How so? By pairing them with supersleek pieces, including a collarless gray coat and matching gray skinny J Brand jeans ($202). Jessica then completed her travel style with a creamy netted sweater, a black tote bag, and oversize sunglasses. Wedge sneakers have practically become a style staple, but what we love about Jessica's latest outfit is that she proved that sporty can indeed look polished — that is, with the right accoutrements. Next time you're heading out of town (or just taking a spin around the neighborhood), take a cue from Jessica's latest and try matching your sneakers with a more luxe-feeling coat and any other pieces that scream chic (think leather pants, silky blouses, and tweed jackets). To get her look, shop our editors' picks below — including Jessica's exact Nike sneakers.

While sitting front row during London Fashion Week, Olivia Palermo proved her ongoing affinity for Tibi — twofold. The style pro worked her Tibi mesh sweater ($175, originally $250) into two standout looks! It's just further proof that this fashion star knows how to rework her closet — or in this case, the contents of her suitcase. At the Temperley London show (left), she mixed the prints in her knit with a zigzag miniskirt, then finished with a black-and-white Tibi blazer and red printed pumps for a funky take on the ladylike look. Prior to that, Olivia sported her Tibi sweater at Sass & Bide (right) with a more laid-back twist, donning a double-zip cape, Paige Premium skinny jeans ($199), and the same graphic heels for a sexy but casual approach. Now it's your turn — score Olivia's exact Tibi sweater at 30 percent off to channel some Palermo-inspired style for work, weekend, and beyond.

Kate Moss styled up a herringbone blazer with paint-splattered skinny jeans, creating the perfect outfit for all your weekend plans. The supermodel completed her ensemble with a black turtleneck, black lace-up booties, a long gold necklace, gold bangles, a black suede Louis Vuitton satchel, and cat-eye sunglasses. Whether you're running errands, meeting friends for brunch, or grabbing dinner and drinks, Kate's latest London look will take you from day to night seamlessly. For a more laid-back vibe, swap the heels with wedge or flat boots for further comfort. Then, take it into formal territory with your jewelry choices. Shop our editors' picks below to get started, and have a happy (and fashionable) weekend!

Naomi Watts and Eva Longoria were both in a pantsuit kind of mood at a Condé Nast Traveler event in Beverly Hills, CA. But each star put her own unique spin on the menswear-inspired look. Naomi kept it tough in black leather pants, a black boyfriend blazer, and a white silky top, finishing the look with classic black pointy, low-heeled pumps. For her suited-up evening, Eva blended a boyish cut with a girlie pink hue and then completed her Boss ensemble with a contrast-collar Monika Chiang blouse, black piped Casadei pumps, and a black patent envelope clutch. Whether you identify with just one of these celeb-approved suits or both, shop our editors' picks below to get the look for yourself.

Last night at the Gents launch party at the Gramercy Park Hotel, Zoe Saldana looked impeccably chic in a sporty black lace top, proving that sweatshirts aren't solely for lounging at home. The actress then completed her all-black ensemble with cropped trousers and cutout booties. Zoe's latest look inspired us to go on the hunt for equally stylish lace sweatshirts that we can incorporate into our daytime and nighttime outfits. Shop our picks below, but first, check out some ideas on how to dress your lace sweatshirt up.

• Pick a lace sweatshirt in a dark hue (black, navy, dark gray) to help give off a dressier vibe.
• To fancy up a light-colored lace sweatshirt, we recommend pairing it with leather pants or fancy trousers.
• You can sport your sweatshirt with your favorite denim (boyfriend, skinny, wide-leg), then kick things up with fancy heels and sparkly baubles.
• An easy way to punch up your lace sweatshirt is to match it up with a pair of colored jeans.

What do actresses Jessica Chastain and Emma Roberts and model Irina Shayk all have in common? Well, you're looking at it. They were all recently spotted toting around stunning green-hued bags, which called major attention to their respective off-duty looks, too. Jessica sported her Dolce & Gabbana Miss Sicily purse with a black coat and black-and-white boots in NYC; Irina, clad in a black Winter coat, also carried her statement green zip-detailed tote; and Emma showed off her green-studded Marni bag, which complemented her brown shearling leather jacket and bright fuchsia scarf perfectly. Any punchy bag has the power to change an outfit, but we'd say emerald green is the one to add to your shopping list because it's 2013's Pantone color of the year. Score similar green bags we're loving below.

While promoting her new movie Der Naechste, Bitte! in Berlin, Diane Kruger reminded us why she's a consummate styler, and it had everything to do with her statement Stella McCartney floral-print silk pants ($925). The actress completed her outfit with a black Stella McCartney tuxedo vest (similar version here), black pointy pumps, and a crisp white watch.

We love the juxtaposition of her structured top against a more relaxed-pant silhouette — it has "chic" written all over it. And it looks like even Diane is jumping on the black-and-white trend bandwagon, and her head-to-toe look is a prime example why. While we can't deny that the actress's two-toned add-ons were sleek — significant in polishing off her look — there's no doubt (in our minds) that her floral pants were the real showstoppers. The best part? They're versatile, too. With the right attention to detail, you can dress them up or down. For a more casual approach, mimic Diane's latest ensemble, but switch out the vest for a knit sweater, and her heels for a pair of sneakers. Then come Spring, punch the outfit up with a bright t-shirt and your favorite sandals. All you need to do is snag your own pair of Diane-inspired statement pants — or shop the exact pair — with a little help from our editors' picks below.

Singer and star of Smash Katharine McPhee attended an event in NYC last night looking superslick in a pair of black leather pants. We too are huge fans of the leather look, but as of late we've been searching for a new way to rock our favorite pairs — that's where Katharine comes in. We love that instead of the typical sexy or edgy vibe, the actress opted for a preppy feel that's still totally night-out appropriate. Katharine started with a jewel-collar blouse by Equipment — shop the white version here ($310) — then topped it with a cozy gray crewneck sweater. On bottom, she matched her leather pants with sleek leather booties, then accessorized with a black clutch and just a few gold baubles. Mimic Katharine's latest with our editor-approved pieces below, and note: if you're looking to inject a little more glamour, all you need is a bold red lip to finish it off.

Gwen Stefani dropped her kids off at school in LA, then headed to the car, showing off her new MICHAEL Michael Kors dotted sweater ($120). We've seen a lot of polka-dot tops, but this one definitely pops thanks to its mix of small and large dots. The white contrast collar, hem, and cuffs lend a sporty flair, and the the faded wash makes this affordable buy even more effortlessly adorable. We also love the way Gwen styled her sweater: with olive skinny jeans, black booties, and slick Karen Walker off-white sunglasses ($250). Score Gwen's exact polka-dot sweater now to work into your Winter wardrobe. Wear it with black trousers or leather pants to dress it up, with jeans for a laid-back vibe, and with leggings when you just feel like lounging at home.

The X Factor UK judge Nicole Scherzinger was spotted — or shall we say checkered — sporting a statement houndstooth coat that immediately caught our sartorial eye. The singer completed her latest London style with black skinny jeans, a black blouse, oversize round sunglasses, pointy booties with a stark white sole, and a bevy of gold baubles, including large hoop earrings. Houndstooth is one of those prints that comes back season after season, but it can very easily go the matronly route. But what we appreciate about Nicole's use of houndstooth is that it's every bit edgy and cool thanks to her use of two off-kilter accessories: exaggerated shades and killer shoes. Follow suit by matching up your houndstooth outerwear with equally smashing accoutrements to take your look from tame to traffic stopping.

Gwyneth Paltrow arrived at LAX to catch a flight in her signature casual-meets-cool travel outfit. And while we can't deny the classic appeal of her gray tee, faded jeans, and gray booties, we couldn't help but zoom in on two noticeably new additions to her jet-set getup: her black-and-white bags from Alice + Olivia's Spring 2013 collection and her bird tattoo. OK, so technically that's three new things to take note of. Neither Gwyneth's satchel nor tote is available to shop yet, but we don't — and shouldn't! — have to wait to get in on the sleek dual-tone look. What we love most about black-and-white bags is that, besides the fact that black and white are the hottest color couple right now, they feature two neutral hues that will go with just about anything in your closet. Plus, they're the easiest way to add instant sophistication to any piece, especially with your go-to denim. Thus, taking a cue from Gwyneth, we hunted down 17 equally fabulous black-and-white bags to add to your closet now.

Little did Alessandra Ambrosio know that when she was out grabbing coffee in LA, she was simultaneously reminding us of the importance of lightness. Case in point: the Victoria's Secret Angel showed off how to colorblock softer Spring colors in the Winter. The model started off her daytime ensemble with a beige batwing turtleneck sweater, then styled it with a pair of rose-colored skinny corduroys. She then added just the right amount of camel via her Rag & Bone Harrow booties ($495). A matching beige leather fringe bag, oversize brown sunglasses, and a few gold baubles made for a shiny finish. We know Spring isn't here (yet), but why not start prepping by experimenting with lighter staples now? Re-create Alessandra's exact look or try mixing and matching pretty, neutral pieces you already own now.

Jessica Alba is in Paris enjoying all the fabulous Paris Couture Fashion Week festivities as we speak. But before she got dolled up for the front rows, she showed off her expert layering skills at the airport. The actress started with black basics, which were the perfect base for her eye-catching and cozy Tory Burch green wool Katie coat ($681, originally $851). She, then, finished her look off with black multi-buckle booties (with playful purple socks peeking out) and a wool hat. Score Jessica's exact Tory Burch coat now — or if the discounted price tag is still too steep, check out some of these less-expensive (but equally cool alternatives): BB Dakota's evergreen coat ($78, originally $130), Calvin Klein's faux leather-trim coat ($110, originally $325), and Lands' End's dark green cocoon coat ($100, originally $200).

While running errands around LA (on more than one day in a row), Jennifer Garner showed off her brand-new shoes: these Isabel Marant Basley black suede tassel booties ($600), which also come in camel and white. At first glance, we thought they were high-top sneakers, but upon closer inspection, we realized they're actually a cross between a sneaker and a bootie — genius! While the price tag is rather steep, we think these booties are worth the investment for a few reasons. First, they're by Isabel Marant, so they're automatically cool in our eyes. Second, they look super comfy. And third, they might just be the new shoe trend of the year (stay tuned). Side note: we also love the way Jennifer wore her new shoes, with a boyish blazer, a plaid blouse, skinny jeans, and a white scarf. All in all, it's a head-to-toe outfit win.