Walsh had some early success on television as the blonde girlfriend on The Drew Carey Show, but it wasn’t until she went red in 2005 for her role in Grey’s Anatomy that she really made it big. Walsh is now one of TV’s highest paid actresses—on her Grey’s spinoff, Private Practice—she earns $275,000 per episode. “I felt like an imposter before,” says Walsh about changing her hair color. “I’m stronger and sassier as a redhead. It’s much more me.”

In 2011, Forbes listed Bieber’s earnings at $53 million. Bieber Fever’s power boils down to his stylized mop top hair—that has helped captivate tweens and mothers worldwide.

Though she’s stolen the scene as the fiery redhead in such films as The Help and Crazy, Stupid, Love, Stone’s natural hair color is blonde. It was during her first major role in 2007’s Superbad that producer Judd Apatow convinced her to embrace the ginger hue, and it has since helped her win an ad campaign for Revlon. Forbes recently predicted that Stone is “on her way to joining the $20 million per film league.”

When Gossip Girl and The Town star Lively changes up her style, it makes as many headlines as when she swaps boyfriends. Her beachy blond waves are highly requested in salons everywhere and have helped her land two covers of Vogue and a Chanel ad campaign. All of this has prompted New York Magazine to declare the "Blake" "the new ‘Rachel.'"

A decade ago, Simpson was just another head of hair in a sea of blondes with pop singles. Today, she’s turned her covetable coif and unique style into a booming business. Her empire of fashion and cosmetic products—estimated to be worth $1 billion—includes a line of hair extensions called Hairdo.

As Carrie Bradshaw on Sex and the City, Parker became a fashion icon. Throughout the show’s six-year run, SJP modelled a variety of hairstyles—natural ringlets, stick straight, long, short—that acted as the ultimate accessory to her trendsetting ensembles. Today, thanks in no small part to the show’s syndication, Parker is one of Hollywood’s highest earning actresses, making $30 million last year.

Zolciak has endured her fair share of wig- and weave-pulling fights on The Real Housewives of Atlanta—particularly involving own blonde hairpiece. Though Zolciak doesn’t need one, she’s open about her preference for wigs over natural hair; she is currently working on starting her own line of faux hair.

Though it’s not exactly his hair, The Boss’ trusty bandanna has been keeping his curls out of his face on stage for decades. The look began with his 1984 album Born in the USA, which established him as a rock icon. We bet the headband resurfaces on his upcoming 2012 tour, which—if you judge by his $156 million 2009 tour—is sure to make a pretty penny.

When Ross emerged as a star for Motown in the 60s, she wore a beehive wig, but it was when she came out as a solo singer that her personal style reined supreme. Her big hair and wild curls helped her to stand out—an iconic look that still defines the pop diva today. As popular as ever, the first leg of Ross’ 2010 tour earned over $4 million dollars.

The mullet goes mainstream. When Billy Ray Cyrus came along in 1992 lamenting his “Achy Breaky Heart,” the world became intimate with the “business in the front, party in the back” haircut. Cyrus’ debut single went to number one and became his signature song. He has since to match its success, and in 2006 he released the single “I Want My Mullet Back.”

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