Nicole Richie sunglasses spandex knit cap

Nicole Richie looked cute as she left the gym in Studio City, Calif., Wednesday. We're loving her hat -- great way to put the hair up after a workout!

Richie had a busy week. Monday she hit up Britney Spears' concert, and Tuesday she said hi to former BFF Paris Hilton at an event for Samantha Ronson's sister, Charlotte, at The Roosevelt Hotel in Hollywood.