Britney Spears, with a police escort of nearly a dozen motorcycles, two cruisers and two helicopters, was removed by ambulance from her home and taken to U.C.L.A. Medical Center, right, early on Thursday, The Associated Press reported. Ms. Spears, 26, whose erratic behavior has made her a public spectacle and cost her the custody of her two young sons, was hospitalized to ?get help,? said a Los …