It’s the newest craze to hit Hollywood: shaking your hips to The Way of the Bellya book and workout DVD from Neena and Veena Bidasha. Already popular performers on the celebrity circuit (they danced at Brad and Jen’s wedding), these identical twins are now bringing belly dancing to the masses as a form of fitness with their star-studded L.A. exercise classes and, for those who can’t make it to class in person, the book and DVD, which not only teach the fundamentals but also include several routines. $20. www.bellytwins.com — J.B.