Justin Bieber has revealed that his upcoming album "Believe," his third, will feature a songwriting collaboration with Taylor Swift. The U.K.'s Capital FM Radio posted audio yesterday from a recent conversation with Bieber on the program Vodafone Big Top 40 in which Bieber announced the country-pop singer-songwriter will join Believe's all-star guest list.When asked whether the Swift collaboration would have a country flavor, Bieber replied in the affirmative and explained that "Believe" will...