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Young & Rich

Originally posted Thursday July 12, 2007 12:00 PM EDT

Earned $12 million in 2006 Photo by: Hollywood Records

Hilary Duff

Actress-singer, Age: 19

IN THE MONEY: Her movie paychecks top $2 million, and she's sold 13 million albums worldwide. But as CEO of her own lifestyle company, she earns about $12 million a year, according to Forbes. Credit growing sales of her Stuff by Hilary Duff clothing line, jewelry and home decor for tweens, which is sold in stores such as Target and Wal-Mart. "It's so funny that people think that I'm a mogul," she says. "I definitely do know a lot about [running a business], but I have so many people that help me."

BIGGEST SPLURGE: Watches, Marc Jacobs bags and "things for my house" in L.A. She and big sis Haylie, 22, also just indulged in a St. Bart's vacay.

HOLD THE PORSCHE: "I definitely don't just buy what I want," she says. "My business manager says I'm well behaved." Case in point: Duff thought about buying a Porsche Cayenne Turbo for nearly $100,000, but her money man said, "You're a terrible driver. You don't need that kind of power."

POWER MOVE: She's tackling the juniors market with a top-selling perfume (With Love . . . Hilary Duff from Elizabeth Arden) and an upcoming fashion line.