Well, it didn't take Joel Madden long to move on from ex, Hilary Duff -- he's been secretly dating Nicole Richie for weeks! The new couple was seen holding hands and dancing at a club in L.A. less than a week after Joel and Hil split, according to Us Weekly. "Nicole couldn't stop smiling," a fellow reveler told the mag. "I've never seen her happier." Joel has even begun introducing Nic to his fam, beginning with a double date with his twin bro/Good Charlotte bandmate, Benji Madden and his GF, Sophie Monk. An onlooker told the mag that Joel had his arm around Nicole for most of the night, and that she "was laughing throughout the meal. She didn't seem too shy to dominate the conversation either!" All we have to say is, for someone who hates the "lifestyles of the rich and the famous," this Joel dates a lot of wealthy A-listers. Explanation, please!