Because they're a necessity year-round, and because they can add an extra dose of cool to any ensemble, sunglasses are one of our favorite, and one of the most important, accessories in our style arsenal. Now, we're giving you the rundown on this season's must-have trends — from retro '50s frames to pretty pastel shades, get all the details here and make a statement with some festive eyewear. Just watch on to see what styles made the cut! On Allison McNamara: Club Monaco blouse, Bebe shorts, Nashelle Designs necklace.
Nicole Trunfio's Off-Duty Style: Camo Jacket & Leather Pants
Australian model Nicole Trunfio strutted NYC in the perfect outfit we can't wait to mimic next weekend. In true New Yorker fashion, Nicole donned all black — ribbed sweater, leather pants, and ankle boots — then added a pop of print via a cool camouflage jacket. The brunette beauty completed her off-duty style with a black leather crossbody bag, cat-eye sunglasses, and a gold chunky watch. To re-create Nicole's effortless outfit, just layer a camouflage jacket over your black-on-black staples, then finish it off with cat-eye shades and a signature model strut.

Chloë Sevigny Bundles Way Up in a Green Shearling Coat
Chloë Sevigny stopped by the Miu Miu boutique in NYC wearing one of the coziest celebrity Winter looks we've seen yet. The actress bundled up in a cozy green shearling coat, then, to make her outerwear the main focus, kept the rest of her outfit all black. She sported black leggings with leather riding boots, cat-eye sunglasses, and a mini satchel on her arm. Mimic Chloë's Winter cool by sporting all black and finishing off your ensemble with an equally fuzzy all-shearling coat. Don't forget the exaggerated cat-eye sunglasses for that perfect retro touch.

Heidi Klum's Chic Add-Ons: Leopard Scarf and Cat-Eye Shades
Heidi Klum took her family to lunch in Beverly Hills looking slender in skinny jeans and sky-high pumps. Up top she wore a silky olive blazer over a navy tunic, then topped it all off with a fabulous blue and yellow leopard scarf by Theodora & Callum. On her eyes Heidi sported blue Christian Dior cat-eye sunglasses, and on her arm she carried a new black Versace satchel. Re-create Heidi's navy and olive color scheme by matching an olive blazer with a navy top, then finishing off with a coordinating scarf. Don't forget the skinny jeans and pumps to achieve Heidi's svelte look.

Eva Mendes Goes Casual Cool in Boyfriend Jeans and Sneakers
Eva Mendes went grocery shopping in LA, wearing a casual cool outfit that proves that the high-top sneaker trend is going strong through 2013. The actress started her look with a navy sweater and a black tank, then finished with torn boyfriend jeans and these Isabel Marant sneakers ($640). For accessories, she carried a vintage-inspired tan crossbody bag and black cat-eye sunglasses. Mimic Eva's latest look by matching up your boyfriend jeans with sneakers, then get cozy up top with your favorite sweater.

Radiate Sunshine in Lily Aldridge's Pleated Yellow Top
Victoria's Secret model Lily Aldridge created major buzz when she strutted the streets of NYC in a chic black-and-yellow pairing: this yellow pleated Alexander Wang blouse ($347, originally $495), slick leather pants, and black suede pumps. She then topped her ensemble with rimless cat-eye Miu Miu shades and a statement crocodile Céline tote. Pair Lily's sunny topper with leather leggings and black pumps for a night out, swap the edgy bottoms for this tweed Worthington pencil skirt ($25) for a polished office look, or follow these simple steps to instantly brighten all of your Fall neutrals.

Score Lauren Conrad's Festive Ho Ho Ho Sweater Pronto!
Lauren Conrad strolled the holiday-themed sidewalks of The Grove in LA looking equally festive and adorable in this Ho! Ho! Ho! sweater by Lot 78 ($325). We love that she kept her bottoms edgy and classy via black leather pants and black suede pumps. Her trusty Balenciaga bag ($1,895) and a pair of cat-eye Elizabeth and James sunglasses ($185) completed her daytime style. Score Lauren's exact sweater now to work into your holiday wardrobe. You can pair it with leather pants like she did or throw it over your favorite denim. For a more ladylike take, sport your sweater with a black pencil skirt.

Miranda Kerr's Flashy Add-Ons: Leopard Loafers and Gold Shades
If you're on the hunt for an ensemble that transitions from a casual day at work to dinner and drinks, then look no further than Miranda Kerr's latest NYC look. The model worked true-blue Nobody denim ($291) and a black, sheer-sleeved blouse with tasseled leopard Prada loafers and her trusty leather Givenchy bag ($2,405). Her gold glitter Miu Miu shades ($390) lent a touch of sparkle, while her mixed-metal jewels, slick topknot, and punchy pink lipstick were the icing on her chic street style.

Fab For Fall: Anne Hathaway's Olive Jacket-and-Tee Combo
Anne Hathaway arrived in Tokyo sporting a fabulous Fall travel ensemble: an olive tweed jacket over a coordinating olive tee. On bottom she wore faded skinny jeans by Citizens of Humanity ($228) and black ankle boots. For accessories, the actress showed off blue cat-eye sunglasses by Christian Dior and a red-and-pink tassel necklace. We love this monochromatic pairing for the airport or just weekendwear. You can even dress it up for the office via black trousers and pumps. Love Anne's latest styling as much as we do? Shop similar pieces below, or re-create the look by matching two pieces in the same color family.

Add a Dalmatian-Print Bag to Your Fall Mix à la Mandy Moore
Mandy Moore was primped and ready for her day working a tan pullover sweater and cropped skinny jeans after leaving the Anastasia salon in Beverly Hills. Her layered look kept her cozy for a crisp Fall day, while her two-toned ankle boots and tortoise cat-eye shades upped the cool factor. But what really caught our eye was Mandy's python and dalmatian-print shoulder bag. We have seen a slew of celebs toting leopard bags, but Mandy's dalmatian print is a welcomed change. Channel this laid-back look for your next day of errands with a knit sweater, cropped denim, black boots, and a dalmatian-print tote.
