Nicole Richie had one of her favorite juices in hand yesterday when she arrived for a workout in LA. She's staying in top shape in the run up to a busy fashion week. Nicole will step out on Fashion's Night Out, Sept. 8, to cohost events at the Beverly Center along with the city's mayor, Antonio Villaraigosa, and Vogue's Lisa Love. Winter Kate designer Nicole also just shared a peek at her Spring 2012 lookbook for the collection. While Nicole's staying busy with her clothing endeavors, her husband Joel Madden is all about his band. He attended Sunday's MTV VMAs, where he told us on the white carpet that their kids, Harlow and Sparrow, are already shaping up to be musicians themselves! He was back in the studio yesterday, tweeting, "Finally back in the studio. Nothing feels better than creation."