Justin Timberlake and Alex Rodriguez held court Wednesday night at The Darby — but on different floors. Timberlake was surrounded by a crew that appeared to be friends from his Tennessee hometown on the dining floor of the supper club, while A-Rod lounged downstairs with a group of guys — but not girlfriend Cameron Diaz. Singer JoJo hit the dining-area stage for an impromptu performance. Mary-Kate and Ashley Olsen were seen wandering toward the bathroom area.