Kevin Costner is known as a Hollywood heartthrob -- but the notoriously private actor shares with "Extra" that he's anything but the typical Tinseltown guy. "I'm not that too-cool-for-school," said Costner. "Somebody told me my picture is on a billboard on Sunset Blvd., I'm going to go out there with my 1-year-old and take a picture of it!" "Extra" joined Kevin on the set of his new comedy "Swing Vote," where he dished about his past bad luck in love -- including the $80-million divorce from ex ...