In "The Twilight Saga," Nikki Reed plays Rosalie Hale, a vampire Twi-hards love to hate. But in real life, the 24-year-old actress, who spoke to Yahoo! Movies about gearing up for the popular big-screen series' end, couldn't be further from her blood-thirsty character.  Reed shared details about a not-so-well-kept secret -- a scene that will appear during the end credits of the franchise's fin…