Spears upbeat after filing for divorce (AP)

LOS ANGELES - Britney Spears " /> SEARCH News | News Photos | Images | Web " /> Britney Spears appeared upbeat, if a little off balance, as she took to the ice skating rink at New York's Rockefeller Center just hours after filing for divorce in Los Angeles. The 24-year-old pop star cited "irreconcilable differences" in court papers filed Tuesday seeking dissolution of her marriage to aspiring rapper Kevin Federline. As seen in a video posted late Tuesday by the entertainment Web site TMZ.com, Spears ...