Troubled socialite Nicole Richie has stepped down as host of a Las Vegas New Year's Eve (31DEC06) party following her arrest on DUI charges last week (11DEC06). The party girl confessed to cops she had taken Vicodin and smoked marijuana when pulled her over after being spotted driving the wrong way on a Burbank, California freeway. The scandal has seen her cancel the appearance at Tangerine night club. She'll be replaced by rocker Dave Navarro. STEVE DAVIDOVICI, of Pure Management Group, who run the club, says, "We love Nicole and we wish her the best. We hope to bring her back in the future."