After Hours
When he's not fronting the world's biggest rock band, Bono contributes guest Op-Ed columns to The New York Times and lobbies for African aid and debt relief.
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Ryan Adams
In 2008, singer-songwriter Ryan Adams interned at BlackBook magazine, where he fetched coffee, sorted mail and wrote record reviews.
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Lady Gaga
Lady Gaga has said she'd like to intern for hat designer Philip Treacy (left) after the two collaborated on Gaga's wardrobe. The pop star is also a creative director at Polaroid.
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Madonna
Madonna has written four children's books, including The English Roses and Mr. Peabody's Apples, and directed movies like 2008's Filth and Wisdom and the Malawi documentary I Am Because We Are (her efforts in the African nation also include a charitable organization called Raising Malawi). The Queen of Pop also designs a clothing line for department store H&M.
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Ringo Starr
The Beatles' drummer has done voiceovers for the popular British children's show Thomas the Tank Engine.
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Sammy Hagar
After leaving Van Halen, Hagar made it big with his Cabo Wabo brand tequila.
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Britney Spears
The pop star has dabbled in creating fragrances like Beauty and experimented with less-successful ventures like her NYLA restaurant in New York, which has since closed.
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Maynard James Keenan
Tool's frontman, who has an impressive collection of wine numbering 6,000 bottles, operates the Arizona winery Caduceus.
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Joe Perry
The Aerosmith guitarist, a fan of spicy food since he was a kid, owns a line of hot sauce called Rock Your World.
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Gwen Stefani
Since 2004, the No Doubt singer has designed the clothing line L.A.M.B.
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Jay-Z
Jay-Z's business ventures have included the successful Rocawear clothing line, his 40/40 nightclubs and a partial stake in the New Jersey Nets.
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Andy Summers
Since 1979, the Police guitarist has honed his skills as a photographer and published three books of work, including 2007's I'll Be Watching You: Inside the Police 1980-83.
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Justin Timberlake
In addition to owning New York's Southern Hospitality restaurant, Timberlake designs clothes under his brand William Rast.
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Jennifer Lopez
J.Lo has her hand in numerous side projects as a designer (J.Lo by Jennifer Lopez), restaurant owner, television producer (DanceLife) and actress (Out of Sight).
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Patrick Stump
Fall Out Boy's guitarist has contributed reviews to Rolling Stone, writing under the name P.V. Stump.
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Marilyn Manson
In 2008, Manson launched a line of absinthe called Mansinthe.
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Mariah Carey
The pop star has a line of fragrances and spearheaded Camp Mariah, which sends 300 inner-city children to camp each summer.
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Beyoncé
Beyoncé, with her mother Tina, designs clothing under the brand House of Dereon.
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Miley Cyrus
The Disney star designs a line of clothing for Walmart with Max Azria.
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Diddy
The hip-hop mogul owns the clothing line Sean John and has produced (and starred on) a slew of MTV Making the Band shows.
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Michael Stipe
The R.E.M. frontman has produced several movies, including 1999's indie smash Being John Malkovich.
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Liam Gallagher
The Oasis singer is currently working on a movie about the Beatles, based on the 1972 book The Longest Cocktail Party: An Insider's Diary of the Beatles, Their Million Dollar Apple Empire and Its Wild Rise and Fall.
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Hold Steady’s Craig Finn and Tad Kubler
Hold Steady's Finn is working on a film adaptation of writer Chuck Klosterman's book Fargo Rock City while Kubler has developed a photography career, and has had his photos published in Rolling Stone.
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Jimmy Buffett
Buffett has built a multimillion-dollar empire with his Cheeseburger in Paradise and Margaritaville restaurants and has recently moved into selling frozen foods and drink makers.