Which of Hollywood’s style stars had readers buzzing this week? Don’t miss our top stories!

–Anne Hathaway flashes her glimmering emerald-cut engagement ring. READ IT

–Jennifer Aniston sort of admits she’s tried injectables. READ IT

–Katy Perry is back to blonde — and her stylist dishes on her latest look. READ IT

–Matthew McConaughey shaves off his trademark golden curls. READ IT

–Kendall Jenner discusses her pre-runway nerves, and why she’s excited to model again. READ IT

Matthew McConaughey stepped out in Beverly Hills on Tuesday sporting a T-shirt, baseball cap — and totally bald head! Though he concealed his shiny scalp underneath his j.k. livin hat, it was quite obvious the star had shaved off all of his golden curls — but the smile on his face said he didn’t seem to care.

On Saturday, McConaughey was spotted on the Los Angeles set of his latest film, Thunder Run, with a full head of hair — so why the change? It’s the first time he’s made a major modification to his luscious locks since 2008, when he debuted a super-short buzz cut.

Obviously McConaughey, one of PEOPLE’s former Sexiest Men Alive, can do no wrong, but personally, we’re going to miss those cute curls. Tell us: What do you think of the actor’s new look?

VOTE ON GUYS’ HAIRCUTS IN ‘WHAT’S HIS BEST HAIR?’

Courtesy Dolce & Gabbana

We never had any doubt that beneath Matthew McConaughey‘s California-cool demeanor beat the heart of a gentleman–and the actor’s newest gig proves just how debonair he can be. Looking red-carpet ready in an elegant tux, Matthew fronts the campaign for Dolce & Gabbana’s newest scent, The One Gentleman. “A gentleman has respect for himself, that is the basis of his respect and consideration for others,” he explains of the inspiration behind the new scent. “He has a strength and grace that translates into how he moves, how he makes a decision, or even how he holds himself still and says nothing at all.” And while the ad, shot by Jean Baptiste Mondino, won’t be hitting magazines until October, we have this exclusive sneak peek. This isn’t the actor’s first time in front of the camera for the beauty brand, having launched the original The One men’s scent in 2008. The new juice, which contains notes of pepper, grapefruit, fennel, patchouli and vanilla, will begin rolling out at the end of this month and will be available nationwide in October. Prices begin at $42 for a 30 ml eau de toilette. Tell us: What do you think of Matthew as the face of The One Gentleman? –Katherine Kluznik Rentmeester

Venturelli/WireImage

Domenico Dolce and Stefano Gabbana clearly know how to throw a festa. The venerable Italian design duo hosted a star-studded affair at Milan’s Piazza della Scala Saturday, complete with a multimedia exhibition, fashion show and gala–and of course, a slew of A-list guests, all chicly dressed in head-to-toe Dolce & Gabbana. Starry couple Matthew McConaughey and Camilla Alves were doubly glam at the Anniversary exhibition Saturday, where McConaughey donned a classic black tuxedo and Alves sparkled in a white chiffon babydoll dress with crystal details and sequin pumps. Among the high-wattage party goers manning the front row of the Men’s 2011 Spring/Summer runway show, were Oscar-winning actress Rachel Weisz, who looked lovely in a tulle strapless cocktail dress with a sweetheart neckline and ankle-strap heels, and Gossip Girl star Chase Crawford, who looked dapper in a khaki two-button suit with a black tie. Happy anniversary, indeed. For more on Dolce & Gabbana’s men’s collection, visit dolcegabbana.com.

Venturelli/WireImage

Gaz Shirley/Pacific Coast News

Matthew McConaughey has plenty on his plate between his acting career, modeling for Dolce & Gabbana and being a new dad, but he just launched a brand-new online store for his clothing line j.k. livin. The name takes its inspiration from McConaughey’s 1993 film Dazed and Confused, while his father is the man stenciled into the line’s logo. So what can you expect from the online arm of such a personal project? Jklivinstore.com has apparel for men and women, including sweatshirts and T-shirts, as well as accessories, infant onesies and even frisbees and wristbands! In the next few weeks, expect to see more T-shirt designs and sweatbands with music downloads, gift cards, foundation donations and more to roll out in the future. Check out the brand’s inspirational message and organic items at jklivinstore.com.

David G. Morgan/Bauer-Griffin

If anyone is qualified to design a beachwear line, it’s Matthew McConaughey. The perpetually shirtless actor has honed his knowledge of swim trunks, flip flops and bandanas over the years — and now he’s adding a surf-inspired line to his j.k livin T-shirt line. The line of swimwear and beach accoutrements will be available on his website Matthewmcconaughey.com starting this summer, according to his rep. Tell us: Will you buy Matthew’s clothing line?

Agent 47/WENN

It’s been a busy week for Hollywood’s hair stylists, who’ve transformed some of our favorite stars with drastic new dos. We’ve seen Amy Winehouse go platinum, Jessica Biel lighten her locks to a rich honey blonde — and now they’ve turned their shears on Matthew McConaughey. The Fool’s Gold star, who usually favors a shaggier look, has been showing off this new buzz cut. We love that we can see more of his gorgeous face now! Tell us: Do you like Matthew’s new cropped look, or are you hoping he grows it all back?

Evan Agostini/AP

Leave it to Dolce & Gabbana to bring out the stars to celebrate their new Madison Avenue flagship store in N.Y.C. From the new face of their fragrance Matthew McConaughey (with girlfriend Camilla Alves) to his How to Lose a Guy in Ten Days costar Kate Hudson, the Gramercy Park Hotel was packed with a-list stars for last night’s dinner. And they were all smokin’ hot in their Dolce & Gabbana outfits. Eva Mendes told PEOPLE that the designers picked out her dress because “they kind of know what I like now because I’m such a diehard fan.” Anne Hathaway described her glittering black look as “definitely sexy without being too revealing.” Molly Sims summed it up best, saying “If you wear Dolce, you are hot, you are sexy.” We couldn’t agree more.

David G. Morgan/Bauer-Griffin

Sexy stars making sexy ads — who doesn’t want to see that in magazines come spring? Thanks to Fashionweekdaily.com, we’ve gotten the scoop on more than a few great ads in the making. Matthew McConaughey is set to be the face (and hopefully bare chest!) of Dolce & Gabbana fragrances, while Patrick Dempsey is rumored to be making a McDreamy appearance in the Versace campaign. But it’s not just about the guys. Kirsten Dunst will be following in the fashionable footsteps of Lindsay Lohan and Maggie Gyllenhaal in appearing in the Miu Miu campaign for spring, and Fashionista.com is reporting on the rumors that Victoria Beckham just might be the next Marc Jacobs girl. We officially have spring fever!

It’s a rare thing to find Matthew McConaughey wearing a shirt, let alone a suit, but PEOPLE’s former Sexiest Man Alive indeed suited up – in brown and orange plaid, no less – to plug his latest film, We Are Marshall. And when the film is released on Dec. 22, you might recognize McConaughey’s ’70s-inspired threads. Why? Well, he sported those suits in the film. Like another actor who has been caught wearing his costumes off-screen, McConaughey explains that his clothes brought things into focus for him. “The plaid suit helped me find the character,” he told the press. “I loved it. Still wearing them!” Fair enough, but we think McConaughey might just have a flair for the ’70s. What do you think about McConaughey’s dated threads? And should actors still wear their costumes when filming wraps?

Photo: Ramey

Believe it or not, men worry about hemlines, too. And when it comes to how short shorts should be, there is a growing debate. After seasons of long, droopy shorts ruling the lower bodies of men, they have been creeping up on some of summer’s hottest bodies. Matthew McConaughey (left) has become the ubiquitous boy of summer, spending all of his time outdoors in shorts and not much else. If you can pry your eyes off his torso, you’ll see that he is sporting the most popular short length for the summer: just at the knee. For those who feel even buffer? They may follow Hugh Jackman’s (middle) lead and head for a few inches above the knee. Or for the superfit, like David Beckham (right), the teeny, tiniest briefs will do nicely.

Tell us: What length do you like men’s shorts?

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For more summer fun, check out our 9 Star Ways to Beat the Heat Gallery

Photo: DR/X17, carlos costas/austra/zuma, louie d/ldpimages