It's the ultimate high-school girl's fantasy. You're on a Hollywood soundstage, surrounded by a hairdresser, makeup artists and racks of beautiful clothes. An MTV camera crew follows you as you shoot a commercial for which you're getting paid big bucks.Welcome to the world of Hayden Panettiere, who's been in front of the cameras since her first audition for a commercial at 8 months old, "before she could even sit up straight," says her mom, Lesley Vogel. Panettiere, who turns 18 on August 21, stars on the NBC hit Heroes as Claire Bennet, the character who inspired the catchphrase "Save the cheerleader, save the world."At this Sunday-morning shoot, Hayden is joined by her 12-year-old brother, Jansen, who's followed her into show business. In the Nickelodeon m
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