As Rihanna Bails, Others Step In 2011

The pop singer Rihanna isn't exactly making many friends on the benefit circuit. Two weeks ago she canceled on a cancer fund-raiser in Los Angeles and Cee-Lo Green stepped in at the last minute.On Saturday, she was meant to perform at yet another fund-raiser in Palm Beach, this for the Dana-Farber Cancer Institute and the Jimmy Fund, at Mar-a-Lago with Donald and Melania Trump watching. But at