Here's Why Rihanna's Been Holed Up in the U.K. (VIDEO)

Ever since announcing that she would be working with British apparel brand River Island to create her first-ever fashion line last summer, Rihanna has been hard at work in preparation for its London Fashion Week debut. In a recently-released teaser video, the "Diamonds" diva gives fans a behind-the-scenes look at her design process. "Every time I saw