There's nothing better to shake your groove thing in than a disco-inspired jumpsuit. It's slightly different than a romper with shorts in that it's less resort-like and more dressy. We touched on the subject earlier this year because we had a hunch it would become a major Spring craze. And we were right. Emmanuelle Chriqui (in Stella McCartney), Rihanna (in Sonia Rykiel), Gwyneth Paltrow (in Stella McCartney), Diane Kruger, Helena Christensen . . . all these ladies have already shaken their groove thang, and you should, too.