Clarkson performs the national anthem at Yankee Stadium in New York. Plus: Heidi Klum, Kendra Wilkinson, Patrick Dempsey and more

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SLIP 'N' SLIDE

It's all downhill for Kendra Wilkinson as she gives powersliding a whirl Wednesday at the Levi's 3rd Annual Powersliding Championships at the Santa Monica Pier. The Girls Next Door star was one of the judges at the event, which featured competitors sliding down 40-ft., four-story rails and boxes.