Rihanna sure has her hands full these days! Not only does she have her new clothing line with River Island, but she's launching multiple collections with MAC Cosmetics, beginning in May 2013 with RiRi Woo, a lipstick inspired by the singer's favorite MAC red, Ruby Woo. "When you think of makeup, the brand that pops into your mind -- for something legit -- is MAC," Rihanna tells Women's Wear Daily. "Whatever color you want, it's like, 'Let's go to MAC.' I've been using MAC on tour for such a long time it was a natural fit for me. I have always loved makeup, and I always said that if I do it, I want to do it with a credible brand." No wonder she dubbed the collab a "no brainer."