Isabel Marant

On her way into her Santa Monica office, Jessica Alba showed off a casual look that was a happy marriage between sporty and chic — a mix we've been trying to master ever since sneakers became acceptable outside of the gym. The actress kept her style sophisticated thanks to these green houndstooth jeans by Big Star ($106), then pulled in laid-back flair with her black high-top Isabel Marant sneakers. Jessica completed her outfit with a two-toned Gerard Darel coat and two bags: an envelope-style crossbody and a black perforated satchel. Score Jessica's exact houndstooth jeans to work with high-top sneakers (just like she did) or pair them with a silky blouse and pumps for a work-appropriate spin. For a night out, we'd match these printed jeans with a leather tee and killer heels.

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.

Victoria's Secret model Lily Aldridge strolled NYC with baby Dixie wearing this cozy and cool Étoile Isabel Marant knit printed cardigan ($570). Underneath it, she sported a basic white V-neck tee and, on bottom, a pair of jodhpur skinny jeans. For accessories, Lily chose these Chloé studded buckle booties ($1,345) and brown sunglasses. Score her exact cardigan — or this less-expensive BB Dakota aztec cardigan ($105) — to create a similarly cozy Winter look.

Miranda Kerr and Flynn Bloom hit the gym together in LA wearing matching striped tops. The model opted for a black-and-white striped v-neck tee, black leggings, and black Isabel Marant high-top sneakers. She then kicked up her workout style via this black Givenchy satchel ($2,405) and retro-style round sunglasses. Whether you're heading to the gym or just running errands, mimic Miranda's look by matching a classic striped tee with black leggings, high-top sneakers, then finishing off with a statement designer bag and shades.

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.