Kardashian works her hips with a hula hoop at an Old Navy event in Los Angeles. Plus: Mary-Kate Olsen, Nicole Richie, Rob Pattinson and more

HAVING A BALL

Kate Hudson lights up Yankee Stadium with her mega-watt smile Tuesday as she watches new beau Alex Rodriguez and the New York Yankees trump his former Texas Rangers team 12-3. The actress and the baseball star's romance is "somewhat serious," a source tells PEOPLE.



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