On the town

Seen on the scene:Nick Lachey shared a stage with Tom Arnold at a charity event in Vegas last weekend, where the two were auctioning a Ferrari for the Dance to Erase MS benefit in Century City. "This is a great car - I have one of these," Lachey told the crowd, but was unimpressed when Arnold quipped, "When did you get one - in the divorce settlement?" Lachey bluntly replied, "No, since the