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Nicole Richie is not only a successful fashion designer, she's also a full-blown fashionista with a closet chalk-full of couture to die for. So who better to host LA's Fashion's Night Out than the House of Harlow designer?

We caught up with Mrs. Madden as she exited her gym decked out in head-to-toe black, after finishing yet another grueling workout in West Hollywood, on Wednesday. The socialite is gearing up to host the first of two scheduled fashion shows for LA's big night of fabulous fashion, beginning next month.

The runway event will feature the hottest looks for fall from several different luxury clothing lines, all hand-picked by Richie herself!

LA's Fashion's Night Out kicks off at West Hollywood's Beverly Center mall on September 8 -- be there, or be square!