Hollywood's Style Stars: The New Class

It seems like only yesterday was wearing feather hair accessories and cutesy clothes. Now, she favors sexy ensembles like this plunging striped top and flouncy mini with spiked booties for a look that’s very good-girl-gone-bad.

The ability to put together an effortlessly cool outfit must run in the Olsen family. M-K and Ashley’s youngest sister pairs a printed dress with a biker vest and black booties, a look that easily transitions into fall if you add opaque tights.

Her Pretty Little Liars character isn’t exactly a fashion plate, but in real life Shay goes for trendy looks like leather shorts. She rocks hers with a hot pink Rebecca Minkoff blazer and a jumble of colorful statement necklaces.

Mad Men’s pint-size fashionista is only 12, but she’s already developed an enviable signature style, opting for age-appropriate ensembles like this sweet skirt, embellished tank and simple pumps. If you’re not already jealous of her wardrobe, you will be once you check out her closet.

Some stars would’ve played it safe and worn these striking ASOS heels with a simple LBD, but Modern Family’s Ariel Winter is a fashion daredevil. She chooses a bright blue dress (hers is Jay Godfrey), which only increases the impact of the eye-catching footwear.

isn’t exactly a red carpet newbie, but she’s stepped up her style game in a major way this year. Case in point: She pulls off the tricky mixed-print trend, wearing a mismatched Miu Miu top and skirt with an unexpected black leather blazer and pink clutch.

The 15-year-old actress shows style wisdom well beyond her years, nodding to Audrey Hepburn with slim cigarette pants and simple espadrilles, but updating the look with a graphic sweater and on-trend cross-body.