Nicole Richie held hands with friends as they left The Forum in LA last night. She was joined by pals Kelly Sawyer and Katherine Power for a date night with Prince at his most recent California concert. Nicole is the latest celeb to take in one of Prince's shows after Penelope Cruz and Javier Bardem recently joined him on stage for a dance. A packed social schedule and routine trips to the gym have kept Nicole busy as she holds down the fort while Joel Madden and his brother Benji tour the globe with Good Charlotte. The brothers made a special cameo in Kuala Lumpur to join Justin Bieber on stage for a song yesterday. Even though he was around the globe, Joel was still thinking of Nicole, and he tweeted, "if I was there, we'd be making out during 'Purple Rain.'"