The ever-growing list of fallen stars, from Michael Vick to Britney Spears, is leading Cathy Yingling, managing director of Y&L PR, to conclude that celebrity endorsement may not be worth the effort for a brand. "Not only do you run the risk that the star will get involved in an embarrassing scandal, there's also the bigger risk that the celebrity will overshadow the product," Yingling writes.

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