Sneak Peek: Stars' Stylish New Costumes

The actress tries out a new look – blonde! – along with a patriotic color scheme as she films a scene for All About Steve.

PEOPLE’s Sexiest Man Alive goes incognito in Hawaiian tourist duds while filming The Informant with Steven Soderbergh.

Batter up! The star steps up to the plate for her romantic comedy Labor Pains.

The actress covers her new bob with a dark wig while shooting up the set of Heroes in tough black leather.

The costars take a dip in a Roman fountain – doing some serious water damage to Bell’s Amsale gown.

The Transformers 2 star hits the books in Earnest Sewn jeans on the campus of Princeton University.

The actress – who is scoring high marks from the film’s producers – models a baby bump on the Labor Pains set.

The star is a retro beauty in her floral dress and sideswept curls as she films Shutter Island with Leonardo DiCaprio (not pictured).

The guys of Entourage – Kevin Dillon, Adrian Grenier, Kevin Connolly and Jeremy Piven – form a stylish squad as they film outside Urth Caffe in West Hollywood.

The Proposal actress is the perfect professional in her crisp black suit and tan Prada purse while filming in lower Manhattan.

The twosome get a running start as they shoot a scene for Veronika Decides to Die in New York City.

Depp gets his engines running as John Dillinger on the Chicago set of Public Enemies.

The actress returns to work in the comedy Growing Pains in a sexy striped halter top.

The British actor looks right at home as he films The International in New York City’s Tribeca neighborhood.

Too much to carry? The distraught-looking star films another scene for Motherhood in N.Y.C.

The Oscar winner returns to film the sequel to the Da Vinci Code – Angels and Demons – in Rome.

Leaving her real-life goth tendencies behind, Marilyn Manson’s girlfriend is the picture of adolescent innocence on the set of Woody Allen’s newest film.

The legendary actress slips seamlessly into her role as Julia Child while strolling with her costar in Paris.

The actor goes for an old-fashioned look – check out those high-waisted pants and suspenders! – on the London set of Shanghai.

She’s up, up and away in her little blue wrap dress as the The Ugly Truth star films inside of a hot air balloon.

Here comes the bride! Mrs. Affleck gets into character in a sweet white dress and veil on the set of This Side of Truth.

The actors continue their work on Marley and Me in Philadelphia where they are a picture-perfect bride and groom on a snowy night.

The Bride Wars star gives the thumbs up on her running shorts and T-shirt as she films the comedy in Central Park.

Hudson’s costar keeps in touch while hanging out on the N.Y.C. set in a peasant blouse and skinny jeans, accessorized with a Coach bag.

The Samantha Who? actress is a beach babe in her cover-up, Alex Woo earrings and oversized sunglasses as she shoots in Santa Monica.

It’s snowing in June on the New York City set of the Oscar winner’s latest film, The Rebound.

Guess they didn’t have to spend much on her wardrobe! The sexy actress frolics on the Canary Islands beach in a tank top and cut-off shorts for her new Pedro Almodévar film.

Taking a break from new beau Lance Armstrong, the star hits the streets of New York in a suit – and a bright blue wig!

She’s a brunette! The actress covers up her blonde locks with a brown wig for her role in G.I. Joe, now filming in Prague.

After filming in N.Y.C. for weeks, the star lives la dolce vita in Rome in a floral dress and espadrille wedges for her new film Duplicity.

Clad in period costumes for their 1971-set drama, the costars walk through Carl Schurz Park in New York with a furry companion.

The star suits up in slightly more weather-appropriate gear in her hooded parka and cap for another scene for Marley and Me.

The actress may be in character as blonde Hannah Montana, but she still flashes her own signature peace sign for the camera.

The Spanish star is a retro bombshell in her floral French Connection halter dress as she readies to shoot her latest film with Pedro Almodovar – their fourth film together.

The actor is dashing in a tuxedo on the set of Amelia, costarring Hilary Swank as the legendary aviatrix Earhart.

The reality star makes her film debut as a bikini babe in Into the Blue 2, now filming in Hawaii.

Better safe than sorry – the actress hits the sunny set of My Sister’s Keeper with an umbrella.

After putting his Borat character to rest, the comedian gets ready to hit the big screen as Gucci-toting Bruno.

The Gossip Girl star hangs tight with another group of pals when she makes a cameo on Entourage with Coach purse and coffee cup in hand.

The funnyman substitutes the ponds of Central Park for the canals of Venice as a gondolier in When in Rome.

The actress makes a dash for it – with a young costar in tow – in a chic black trench coat.

No, she’s not playing Cinderella! The actress makes her way to a carriage in a white Herve Leroux dress while working on a short film for the fashion company Tods.

The actor gets back in costume as superhero Hancock in New York’s Times Square.

The When in Rome star works up a sweat on the N.Y.C. set of the film.

A far cry from her normal glamorous self, the actress goes undercover as a frump in her new film Motherhood.