Celebs' Coolest Summer Jobs

01 of 13

BOOTY STYLING

Expanding her affordable-fashion empire, Jessica Simpson shows off her good jeans at the debut of Jeanswear, her new denim collection at her N.Y.C. showroom in June.

02 of 13

MAKING PERFUME

Jennifer Aniston mixes up her style scents for the London launch of her signature fragrance in July. "I want people to go, 'What is that? You smell great!'" the actress said of the eponymous scent.

03 of 13

MODELING FOR MADGE

Besides traveling on the Warped tour with her band The Pretty Reckless, Taylor Momsen fronts the ad campaign for Madonna's Material Girl fashion line. "Working with Madonna and Lola has been an unbelievable experience," the Gossip Girl star said of being styled by the music icon and her 13-year-old daughter.

04 of 13

DIRECTING A MOVIE

Talk about a busy summer! Madonna takes on the role of director in July, getting behind the lens on the romantic drama W.E. in London.

05 of 13

SCOOPING ICE CREAM

Before teaching Chelsea Clinton to dance, DWTS pro Maksim Chmerkovskiy mans an ice cream truck, serving a cone to fellow dancer Tony Dovolani at an A/X Armani Exchange-sponsored event in L.A.

06 of 13

SELLING OUT ARENAS

OUTREACH PROGRAM — Mark Von Holden/WireImage

While most 16-year-olds spend their summer cramming for the SATs, Justin Bieber performs for thousands of fans during his first major headlining tour in Trenton, N.J. "Thank you to all the fans that came and SCREAMED!" he Tweeted. "I love u ladies."

07 of 13

SHOOTING AN AD

He's baaaack! Summer's hottest leading man, Mad Men's dapper Jon Hamm, takes a water break during a sexy photo shoot in downtown Los Angeles in July.

08 of 13

STARRING IN A PLAY

GOOD STAGING — Alan Davidson/PictureGroup

Nick Jonas gets a standing ovation during his West End theater debut as Marius in Les Misérables – a play he starred in on Broadway as a kid. "What a night," he later Tweeted in June, "first show was amazing."

09 of 13

PENNING A MEMOIR

If a new baby and a TV show weren't enough, Kendra Wilkinson hawks copies of her bestselling book, Sliding into Home, which she signs for fans at a bookstore in New York City in July.

10 of 13

PLAYING BARTENDER

Speaking of reality TV moms: Bethenny Frankel beats the summer heat by whipping up SkinnyGirl margaritas – her new low-calorie beverage – during a cooking segment on The Early Show in New York in July.

11 of 13

RUNNING FOR OFFICE

Grammy-winning artist Wyclef Jean gets the political party started while greeting supporters in Port-au-Prince, Haiti, after announcing his intention to run for president of his native country in August.

12 of 13

PERFORMING AT THE WORLD CUP

SHAKE IT — Dylan Martinez/Reuters/Landov

Those hips don't lie, but they sure can shake! Shakira performs at summer's most-watched event, the closing ceremony of the 2010 World Cup in Johannesburg, South Africa, in July.

13 of 13

REVVING ENGINES

Dangerous curves ahead! Reality star Kim Kardashian makes a white-hot appearance as the official flag girl at the Amp Energy Bullrun Rally race, from New York to Las Vegas, in July.